// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;

namespace templates {
// type
using ll  = long long;
using ull = unsigned long long;
using Pii = pair<int, int>;
using Pil = pair<int, ll>;
using Pli = pair<ll, int>;
using Pll = pair<ll, ll>;
template <class T>
using pq = priority_queue<T>;
template <class T>
using qp = priority_queue<T, vector<T>, greater<T>>;
// clang-format off
#define vec(T, A, ...) vector<T> A(__VA_ARGS__);
#define vvec(T, A, h, ...) vector<vector<T>> A(h, vector<T>(__VA_ARGS__));
#define vvvec(T, A, h1, h2, ...) vector<vector<vector<T>>> A(h1, vector<vector<T>>(h2, vector<T>(__VA_ARGS__)));
// clang-format on

// for loop
#define fori1(a) for (ll _ = 0; _ < (a); _++)
#define fori2(i, a) for (ll i = 0; i < (a); i++)
#define fori3(i, a, b) for (ll i = (a); i < (b); i++)
#define fori4(i, a, b, c) for (ll i = (a); ((c) > 0 || i > (b)) && ((c) < 0 || i < (b)); i += (c))
#define overload4(a, b, c, d, e, ...) e
#define fori(...) overload4(__VA_ARGS__, fori4, fori3, fori2, fori1)(__VA_ARGS__)

// declare and input
// clang-format off
#define INT(...) int __VA_ARGS__; inp(__VA_ARGS__);
#define LL(...) ll __VA_ARGS__; inp(__VA_ARGS__);
#define STRING(...) string __VA_ARGS__; inp(__VA_ARGS__);
#define CHAR(...) char __VA_ARGS__; inp(__VA_ARGS__);
#define DOUBLE(...) double __VA_ARGS__; STRING(str___); __VA_ARGS__ = stod(str___);
#define VEC(T, A, n) vector<T> A(n); inp(A);
#define VVEC(T, A, n, m) vector<vector<T>> A(n, vector<T>(m)); inp(A);
// clang-format on

// const value
const ll MOD1   = 1000000007;
const ll MOD9   = 998244353;
const double PI = acos(-1);

// other macro
#ifndef RIN__LOCAL
#define endl "\n"
#endif
#define spa ' '
#define len(A) ll(A.size())
#define all(A) begin(A), end(A)

// function
vector<char> stoc(string &S) {
    int n = S.size();
    vector<char> ret(n);
    for (int i = 0; i < n; i++) ret[i] = S[i];
    return ret;
}
string ctos(vector<char> &S) {
    int n      = S.size();
    string ret = "";
    for (int i = 0; i < n; i++) ret += S[i];
    return ret;
}

template <class T>
auto min(const T &a) {
    return *min_element(all(a));
}
template <class T>
auto max(const T &a) {
    return *max_element(all(a));
}
template <class T, class S>
auto clamp(T &a, const S &l, const S &r) {
    return (a > r ? r : a < l ? l : a);
}
template <class T, class S>
inline bool chmax(T &a, const S &b) {
    return (a < b ? a = b, 1 : 0);
}
template <class T, class S>
inline bool chmin(T &a, const S &b) {
    return (a > b ? a = b, 1 : 0);
}
template <class T, class S>
inline bool chclamp(T &a, const S &l, const S &r) {
    auto b = clamp(a, l, r);
    return (a != b ? a = b, 1 : 0);
}

template <typename T>
T sum(vector<T> &A) {
    T tot = 0;
    for (auto a : A) tot += a;
    return tot;
}

template <typename T>
vector<T> compression(vector<T> X) {
    sort(all(X));
    X.erase(unique(all(X)), X.end());
    return X;
}

// input and output
namespace io {

// vector<T>
template <typename T>
istream &operator>>(istream &is, vector<T> &A) {
    for (auto &a : A) is >> a;
    return is;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        os << A[i];
        if (i != A.size() - 1) os << ' ';
    }
    return os;
}

// vector<vector<T>>
template <typename T>
istream &operator>>(istream &is, vector<vector<T>> &A) {
    for (auto &a : A) is >> a;
    return is;
}
template <typename T>
ostream &operator<<(ostream &os, vector<vector<T>> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        os << A[i];
        if (i != A.size() - 1) os << endl;
    }
    return os;
}

// pair<S, T>
template <typename S, typename T>
istream &operator>>(istream &is, pair<S, T> &A) {
    is >> A.first >> A.second;
    return is;
}
template <typename S, typename T>
ostream &operator<<(ostream &os, pair<S, T> &A) {
    os << A.first << ' ' << A.second;
    return os;
}

// vector<pair<S, T>>
template <typename S, typename T>
istream &operator>>(istream &is, vector<pair<S, T>> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        is >> A[i];
    }
    return is;
}
template <typename S, typename T>
ostream &operator<<(ostream &os, vector<pair<S, T>> &A) {
    for (size_t i = 0; i < A.size(); i++) {
        os << A[i];
        if (i != A.size() - 1) os << endl;
    }
    return os;
}

// tuple
template <typename T, size_t N>
struct TuplePrint {
    static ostream &print(ostream &os, const T &t) {
        TuplePrint<T, N - 1>::print(os, t);
        os << ' ' << get<N - 1>(t);
        return os;
    }
};
template <typename T>
struct TuplePrint<T, 1> {
    static ostream &print(ostream &os, const T &t) {
        os << get<0>(t);
        return os;
    }
};
template <typename... Args>
ostream &operator<<(ostream &os, const tuple<Args...> &t) {
    TuplePrint<decltype(t), sizeof...(Args)>::print(os, t);
    return os;
}

// io functions
void FLUSH() {
    cout << flush;
}

void print() {
    cout << endl;
}
template <class Head, class... Tail>
void print(Head &&head, Tail &&...tail) {
    cout << head;
    if (sizeof...(Tail)) cout << spa;
    print(std::forward<Tail>(tail)...);
}

template <typename T, typename S>
void prisep(vector<T> &A, S sep) {
    int n = A.size();
    for (int i = 0; i < n; i++) {
        cout << A[i];
        if (i != n - 1) cout << sep;
    }
    cout << endl;
}
template <typename T, typename S>
void priend(T A, S end) {
    cout << A << end;
}
template <typename T>
void prispa(T A) {
    priend(A, spa);
}
template <typename T, typename S>
bool printif(bool f, T A, S B) {
    if (f)
        print(A);
    else
        print(B);
    return f;
}

template <class... T>
void inp(T &...a) {
    (cin >> ... >> a);
}

} // namespace io
using namespace io;

// read graph
vector<vector<int>> read_edges(int n, int m, bool direct = false, int indexed = 1) {
    vector<vector<int>> edges(n, vector<int>());
    for (int i = 0; i < m; i++) {
        INT(u, v);
        u -= indexed;
        v -= indexed;
        edges[u].push_back(v);
        if (!direct) edges[v].push_back(u);
    }
    return edges;
}
vector<vector<int>> read_tree(int n, int indexed = 1) {
    return read_edges(n, n - 1, false, indexed);
}

template <typename T = long long>
vector<vector<pair<int, T>>> read_wedges(int n, int m, bool direct = false, int indexed = 1) {
    vector<vector<pair<int, T>>> edges(n, vector<pair<int, T>>());
    for (int i = 0; i < m; i++) {
        INT(u, v);
        T w;
        inp(w);
        u -= indexed;
        v -= indexed;
        edges[u].push_back({v, w});
        if (!direct) edges[v].push_back({u, w});
    }
    return edges;
}
template <typename T = long long>
vector<vector<pair<int, T>>> read_wtree(int n, int indexed = 1) {
    return read_wedges<T>(n, n - 1, false, indexed);
}

// yes / no
namespace yesno {

// yes
inline bool yes(bool f = true) {
    cout << (f ? "yes" : "no") << endl;
    return f;
}
inline bool Yes(bool f = true) {
    cout << (f ? "Yes" : "No") << endl;
    return f;
}
inline bool YES(bool f = true) {
    cout << (f ? "YES" : "NO") << endl;
    return f;
}

// no
inline bool no(bool f = true) {
    cout << (!f ? "yes" : "no") << endl;
    return f;
}
inline bool No(bool f = true) {
    cout << (!f ? "Yes" : "No") << endl;
    return f;
}
inline bool NO(bool f = true) {
    cout << (!f ? "YES" : "NO") << endl;
    return f;
}

// possible
inline bool possible(bool f = true) {
    cout << (f ? "possible" : "impossible") << endl;
    return f;
}
inline bool Possible(bool f = true) {
    cout << (f ? "Possible" : "Impossible") << endl;
    return f;
}
inline bool POSSIBLE(bool f = true) {
    cout << (f ? "POSSIBLE" : "IMPOSSIBLE") << endl;
    return f;
}

// impossible
inline bool impossible(bool f = true) {
    cout << (!f ? "possible" : "impossible") << endl;
    return f;
}
inline bool Impossible(bool f = true) {
    cout << (!f ? "Possible" : "Impossible") << endl;
    return f;
}
inline bool IMPOSSIBLE(bool f = true) {
    cout << (!f ? "POSSIBLE" : "IMPOSSIBLE") << endl;
    return f;
}

// Alice Bob
inline bool Alice(bool f = true) {
    cout << (f ? "Alice" : "Bob") << endl;
    return f;
}
inline bool Bob(bool f = true) {
    cout << (f ? "Bob" : "Alice") << endl;
    return f;
}

// Takahashi Aoki
inline bool Takahashi(bool f = true) {
    cout << (f ? "Takahashi" : "Aoki") << endl;
    return f;
}
inline bool Aoki(bool f = true) {
    cout << (f ? "Aoki" : "Takahashi") << endl;
    return f;
}

} // namespace yesno
using namespace yesno;

} // namespace templates
using namespace templates;

template <typename T>
T modinv(T a, T MOD) {
    T b = MOD;
    T u = 1;
    T v = 0;
    while (b > 0) {
        T t = a / b;
        a -= t * b;
        u -= t * v;
        std::swap(a, b);
        std::swap(u, v);
    }
    if (a != 1) return -1;
    if (u < 0) u += MOD;
    return u;
}

struct Fraction {
    long long nume, deno;
    Fraction() : nume(0), deno(1) {}
    Fraction(long long nume) : nume(nume), deno(1) {}
    Fraction(long long nume_, long long deno_) {
        assert(deno_ != 0);
        nume = nume_;
        deno = deno_;
        // long long g = std::gcd(nume_, deno_);
        // nume        = nume_ / g;
        // deno        = deno_ / g;
    }

    Fraction &operator+=(const Fraction &p) {
        long long g = std::gcd(deno, p.deno);
        long long d = deno / g * p.deno;
        long long n = p.deno / g * nume + deno / g * p.nume;
        g           = std::gcd(d, n);
        nume        = n / g;
        deno        = d / g;
        return *this;
    }

    Fraction &operator-=(const Fraction &p) {
        long long g = std::gcd(deno, p.deno);
        long long d = deno / g * p.deno;
        long long n = p.deno / g * nume - deno / g * p.nume;
        g           = std::gcd(d, n);
        nume        = n / g;
        deno        = d / g;
        return *this;
    }

    Fraction &operator*=(const Fraction &p) {
        long long g1 = std::gcd(deno, p.nume);
        long long g2 = std::gcd(nume, p.deno);
        long long d  = (deno / g1) * (p.deno / g2);
        long long n  = (p.nume / g1) * (nume / g2);
        nume         = n;
        deno         = d;
        return *this;
    }

    Fraction &operator/=(const Fraction &p) {
        assert(p.nume != 0);
        *this *= p.inv();
        return *this;
    }

    Fraction operator-() const {
        return Fraction(-nume, deno);
    }

    Fraction &operator++() {
        nume += deno;
        return *this;
    }

    Fraction &operator--() {
        nume -= deno;
        return *this;
    }

    Fraction operator++(int) {
        Fraction result = *this;
        ++*this;
        return result;
    }

    Fraction operator--(int) {
        Fraction result = *this;
        --*this;
        return result;
    }

    friend Fraction operator+(const Fraction &lhs, const Fraction &rhs) {
        return Fraction(lhs) += rhs;
    }

    friend Fraction operator-(const Fraction &lhs, const Fraction &rhs) {
        return Fraction(lhs) -= rhs;
    }

    friend Fraction operator*(const Fraction &lhs, const Fraction &rhs) {
        return Fraction(lhs) *= rhs;
    }

    friend Fraction operator/(const Fraction &lhs, const Fraction &rhs) {
        return Fraction(lhs) /= rhs;
    }

    bool operator==(const Fraction &p) const {
        return (nume == p.nume && deno == p.deno);
    }

    bool operator!=(const Fraction &p) const {
        return (nume != p.nume || deno != p.deno);
    }

    bool operator<(const Fraction &p) const {
        return nume * p.deno < deno * p.nume;
    }

    bool operator<=(const Fraction &p) const {
        return nume * p.deno <= deno * p.nume;
    }

    bool operator>(const Fraction &p) const {
        return nume * p.deno > deno * p.nume;
    }

    bool operator>=(const Fraction &p) const {
        return nume * p.deno >= deno * p.nume;
    }

    long long mod_expression(long long MOD) {
        assert(std::gcd(deno, MOD) == 1);
        return nume * modinv(deno, MOD) % MOD;
    }

    Fraction inv() const {
        return Fraction(deno, nume);
    }

    friend std::ostream &operator<<(std::ostream &os, const Fraction &p) {
        return os << p.nume << '/' << p.deno;
    }

    friend std::istream &operator>>(std::istream &is, Fraction &p) {
        long long y;
        is >> y;
        p = Fraction(y);
        return (is);
    }

    Fraction pow(int64_t k) const {
        Fraction ret(1);
        Fraction y(nume, deno);
        while (k > 0) {
            if (k & 1) ret *= y;
            y *= y;
            k >>= 1;
        }
        return ret;
    }
};

void solve() {
    LL(n, x, K);
    VEC(ll, A, K);
    if (x == 0) {
        print(0);
        return;
    }
    x            = n - x;
    const ll inf = 1 << 20;
    vec(ll, dp, n, inf);
    dp[0] = 0;
    for (auto a : A) {
        fori(i, 2 * n) {
            chmin(dp[(i + a) % n], dp[i % n] + 1);
        }
    }
    Fraction ans(dp[x]);
    sort(all(dp));
    ll tot = 0;
    for (auto d : dp) {
        if (d != inf) tot += d;
    }
    fori(i, n - 1, -1, -1) {
        if (dp[i] == inf) continue;
        Fraction f = Fraction(tot + n, i + 1);
        if (f < ans) ans = f;
        tot -= dp[i];
    }
    ll p = ans.nume;
    ll q = ans.deno;
    ll g = std::gcd(p, q);
    p /= g;
    q /= g;
    print(p, q);
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    // cout << fixed << setprecision(12);
    int t;
    t = 1;
    // cin >> t;
    while (t--) solve();
    return 0;
}