#include<bits/stdc++.h>
using namespace std;
using ll = long long int;



//7340033 = 7*2^20, 645922817 = 77*2^23, G = 3
//897581057=107*2^23, 998244353=119*2^23, G = 3
namespace NTT {
vector<int> perm, wp[2]; int root, inv, N, invN;
const int mod = 998244353, G = 3; ///G prim root
int power(int a, int p) {
  int ans = 1;
  while (p) {
    if (p & 1) ans = (1LL*ans*a)%mod;
    a = (1LL*a*a)%mod; p >>= 1;
  } return ans;
}
void precalculate(int n) {
  assert( (n&(n-1)) == 0 && (mod-1)%n==0);
  N = n; invN = power(N, mod-2);
  perm = wp[0] = wp[1] = vector<int>(N);
  perm[0] = 0;
  for (int k=1; k<N; k<<=1)
    for (int i=0; i<k; i++) {
      perm[i] <<= 1; perm[i+k] = 1 + perm[i]; }
  root=power(G,(mod-1)/N); inv=power(root, mod-2);
  wp[0][0]=wp[1][0]=1;
  for (int i=1; i<N; i++) {
    wp[0][i] = (wp[0][i-1]*1LL*root)%mod;
    wp[1][i] = (wp[1][i-1]*1LL*inv)%mod;
  }
}
void fft(vector<int> &v, bool invert = false) {
  if (v.size()!=perm.size())precalculate(v.size());
  for (int i=0; i<N; i++)
    if (i < perm[i])    swap(v[i], v[perm[i]]);

  for (int len = 2; len <= N; len *= 2) {
    for (int i=0, d = N/len; i<N; i+=len) {
      for (int j=0, idx=0; j<len/2; j++, idx+=d) {
        int x=v[i+j], y =
           (wp[invert][idx]*1LL*v[i+j+len/2])%mod;
        v[i+j] = (x+y>=mod ? x+y-mod : x+y);
        v[i+j+len/2] = (x-y>=0 ? x-y : x-y+mod);
      }
    }
  } if (invert) {
    for (int &x : v) x = (x*1LL*invN)%mod; }
}
vector<int> multiply(vector<int> a, vector<int> b){
  int n = 1; while (n < a.size()+ b.size()) n<<=1;
  a.resize(n); b.resize(n);
  fft(a); fft(b);
  for (int i=0;i<n;i++) a[i]=(a[i]*1LL*b[i])%mod;
  fft(a, true); return a;
}

vector<int> conv(vector<int> a, vector<int> b, int NN){
  int n = 1; while (n < a.size()+ b.size()) n<<=1;
  a.resize(n); b.resize(n);
  fft(a); fft(b);
  for (int i=0;i<n;i++) a[i]=(a[i]*1LL*b[i])%mod;

  fft(a, true);

  for(int i = NN; i<a.size(); i++){
    a[i%NN] += a[i];
    if(a[i%NN] >= mod) a[i%NN] -= mod;
  }

  a.resize(NN);

  return a;
}

vector<int> selfconv(vector<int> a, int NN){
  int n = 1; while (n < a.size()+ a.size()) n<<=1;
  a.resize(n);
  fft(a);
  for (int i=0;i<n;i++) a[i]=(a[i]*1LL*a[i])%mod;

  fft(a, true);

  for(int i = NN; i<a.size(); i++){
    a[i%NN] += a[i];
    if(a[i%NN] >= mod) a[i%NN] -= mod;
  }

  a.resize(NN);

  return a;
}


};



const int base = 1e9;
const ll mod = 998244353;

int divide(vector<int>& a, int b){
    int carry = 0;
    for (int i=(int)a.size()-1; i>=0; --i) {
        long long cur = a[i] + carry * 1ll * base;
        a[i] = int (cur / b);
        carry = int (cur % b);
    }
    while (a.size() > 1 && a.back() == 0)
        a.pop_back();

    return carry;
}

vector<int> tonum(string& s){
    vector<int> a;
    for (int i=(int)s.length(); i>0; i-=9)
        if (i < 9)
            a.push_back (atoi (s.substr (0, i).c_str()));
        else
            a.push_back (atoi (s.substr (i-9, 9).c_str()));

    return a;
}

int dp[2][10005];

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    cin>>n;

    int rem;
    cin>>rem;

    assert(0 <= rem && rem < n && n <= 10000);

    string ss;
    cin>>ss;

    assert(ss.size() <= 100000 && 1 <= ss.size());
    assert(ss[0] != '0');

    for(auto c : ss){
        assert(isdigit(c));
    }

    auto T = tonum(ss);

    auto tmp = T;
    auto kk = divide(tmp, mod-1);

    int pref = divide(T, n);
    auto k = divide(T, mod-1);

//    pref--;
//    if(pref < 0){
//        pref += n;
//        k--;
//        if(k < 0)
//            k += mod-1;
//    }

//    auto T = stoll(s);
//    auto pref = T % n;
//    T /= n;
//    auto k = T % (mod-1);

    vector<int> P(n), Full(n);
    P[0] = 1;

//    cout<<k<<" "<<pref<<endl;


    dp[0][0] = 1;
    int cur = 0;
    for(int i = 0; i<n; i++){
        cur^=1;
        for(int s = 0; s<n; s++){
            if(s-i >= 0)
                dp[cur][s] = dp[cur^1][s] + dp[cur^1][s-i];
            else
                dp[cur][s] = dp[cur^1][s] + dp[cur^1][s-i+n];

            if(dp[cur][s] >= mod)
                dp[cur][s] -= mod;
        }

        if(i+1 == pref){
            for(int j = 0; j<n; j++)
                P[j] = dp[cur][j];
        }
    }

    for(int i = 0; i<n; i++){
        Full[i] = dp[cur][i];
    }

//    for(int i = 0; i<n; i++)
//        cout<<P[i]<<" ";
//    cout<<endl;
//
//    for(int i = 0; i<n; i++)
//        cout<<Full[i]<<" ";
//    cout<<endl;


    /// FULL^k

    vector<int> ans(n);
    ans[0] = 1;


    while(k){
        if(k&1){
            ans = NTT::conv(ans, Full, n);
        }
        Full = NTT::selfconv(Full, n);
        k >>= 1;
    }

    ans = NTT::conv(ans, P, n);

    ll sum = 0;
    for(int i = 0; i<n; i++){
        sum = (sum + ans[i]) % mod;
    }

    assert(sum == NTT::power(2, kk));

    assert(ans[rem] >= 0 && ans[rem] < mod);


    cout<<ans[rem]<<endl;





    return 0;
}