#include<bits/stdc++.h>
using namespace std;
const int MAX = 1000000;
const int MOD = 998244353;
long long fac[MAX], finv[MAX], inv[MAX];
void COMinit() {
  fac[0] = fac[1] = 1;
  finv[0] = finv[1] = 1;
  inv[1] = 1;
  for (int i = 2; i < MAX; i++){
    fac[i] = fac[i - 1] * i % MOD;
    inv[i] = MOD - inv[MOD%i] * (MOD / i) % MOD;
    finv[i] = finv[i - 1] * inv[i] % MOD;
  }
}
long long COM(int n, int k){
  if (n < k) return 0;
  if (n < 0 || k < 0) return 0;
  return fac[n] * (finv[k] * finv[n - k] % MOD) % MOD;
}
int main() {
  COMinit();
  long N,A,B,K;cin>>N>>A>>B>>K;
  long ans=0;
  for(long a=0;a<=N;a++){
    if((K-a*A)%B==0){
      long b=(K-a*A)/B;
      if(0<=b&&b<=N)ans=(ans+COM(N,a)*COM(N,b))%MOD;
    }
  }
  cout<<ans;
}

/*
aA+bB=K
a,b=0~N

NCa*NCb

*/