#include <iostream>

typedef long long ll;
typedef double lf;

// #define DEBUG 1
struct IO
{
    #define MAXSIZE (1 << 20)
    #define isdigit(x) (x >= '0' && x <= '9')
    char buf[MAXSIZE], *p1, *p2;
    char pbuf[MAXSIZE], *pp;
    #if DEBUG
    #else
    IO() : p1(buf), p2(buf), pp(pbuf) {}
    ~IO() {fwrite(pbuf, 1, pp - pbuf, stdout);}
    #endif
    #define gc() (p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, MAXSIZE, stdin), p1 == p2) ? ' ' : *p1++)
    #define blank(x) (x == ' ' || x == '\n' || x == '\r' || x == '\t')

    template <typename T>
    void Read(T &x)
    {
        #if DEBUG
        std::cin >> x;
        #else
        bool sign = 0; char ch = gc(); x = 0;
        for (; !isdigit(ch); ch = gc())
            if (ch == '-') sign = 1;
        for (; isdigit(ch); ch = gc()) x = x * 10 + (ch ^ 48);
        if (sign) x = -x;
        #endif
    }
    void Read(char *s)
    {
        #if DEBUG
        std::cin >> s;
        #else
        char ch = gc();
        for (; blank(ch); ch = gc());
        for (; !blank(ch); ch = gc()) *s++ = ch;
        *s = 0;
        #endif
    }
    void Read(char &c) {for (c = gc(); blank(c); c = gc());}

    void Push(const char &c)
    {
        #if DEBUG
        putchar(c);
        #else
        if (pp - pbuf == MAXSIZE) fwrite(pbuf, 1, MAXSIZE, stdout), pp = pbuf;
        *pp++ = c;
        #endif
    }
    template <typename T>
    void Write(T x)
    {
        if (x < 0) x = -x, Push('-');
        static T sta[35];
        int top = 0;
        do sta[top++] = x % 10, x /= 10; while (x);
        while (top) Push(sta[--top] ^ 48);
    }
    template <typename T>
    void Write(T x, char lst) {Write(x), Push(lst);}
} IO;
#define Read(x) IO.Read(x)
#define Write(x, y) IO.Write(x, y)
#define Put(x) IO.Push(x)

using namespace std;

const int MAXN = 4e4 + 10;

int n, mod;

ll fac[MAXN], inv[MAXN];
inline ll Qpow(ll x, ll y) { ll res = 1; while (y) (y & 1) && (res = res * x % mod), x = x * x % mod, y >>= 1; return res; }

ll f[MAXN], g[MAXN];
inline void add(ll &x, ll y) { (x += y) >= mod && (x -= mod); }

int main()
{
    // freopen("B.in", "r", stdin);
    // freopen("B.out", "w", stdout);
    #if DEBUG
    #else
    ios::sync_with_stdio(0), cin.tie(0);
    #endif

    Read(n), Read(mod);

    fac[0] = fac[1] = inv[0] = inv[1] = 1;
    for (int i = 2; i < MAXN; i++) fac[i] = fac[i - 1] * i % mod, inv[i] = (mod - mod / i) * inv[mod % i] % mod;
    for (int i = 2; i < MAXN; i++) inv[i] = inv[i - 1] * inv[i] % mod;

    f[0] = 0, g[0] = 1;
    int m = n << 1; ll tmp;
    for (int i = 0; i < n; i++)
    {
        for (int k = 1; i + k <= n; k++)
        {
            int p = m - ((i << 1) + k + 1), q = p - k + 2;
            if (k > 1)
            {
                tmp = fac[p] * inv[q] % mod;
                add(f[i + k], f[i] * (k - 1) * k % mod * tmp % mod);
                add(f[i + k], g[i] * (k - 1) % mod * tmp % mod);
            }
            tmp = fac[p] * inv[q - 1] % mod;
            add(g[i + k], f[i] * k % mod * tmp % mod);
            add(g[i + k], g[i] * tmp % mod);
        }
    }
    cout << (fac[m] * inv[n] % mod * Qpow(2, mod - 1 - n) % mod - f[n] - g[n] + 2 * mod) % mod << '\n';
    return 0;
}