#include <bits/stdc++.h>
#include <atcoder/convolution>
using namespace std;
const long long MOD = 998244353;
long long modpow(long long a, long long b){
  long long ans = 1;
  while (b > 0){
    if (b % 2 == 1){
      ans *= a;
      ans %= MOD;
    }
    a *= a;
    a %= MOD;
    b /= 2;
  }
  return ans;
}
long long modinv(long long a){
  return modpow(a, MOD - 2);
}
vector<long long> inverse(vector<long long> f){
  int N = f.size();
  vector<long long> ans(1);
  ans[0] = 1;
  for (int i = 1; i < N * 2; i *= 2){
    vector<long long> ans2 = ans;
    ans2.resize(i * 4);
    int N2 = min(N, i * 2);
    vector<long long> f2(i * 4, 0);
    for (int j = 0; j < N2; j++){
      f2[j] = f[j];
    }
    ans2 = atcoder::convolution(ans2, ans2);
    ans2.resize(i * 2);
    ans2 = atcoder::convolution(ans2, f2);
    ans2.resize(i * 2);
    for (int j = 0; j < i; j++){
      ans2[j] = MOD - ans2[j] + ans[j] * 2;
      ans2[j] %= MOD;
    }
    swap(ans, ans2);
  }
  ans.resize(N);
  return ans;
}
int main(){
  long long P1, P2, Q1, Q2;
  int T;
  cin >> P1 >> P2 >> Q1 >> Q2 >> T;
  long long P = P1 * modinv(P2) % MOD;
  long long Q = Q1 * modinv(Q2) % MOD;
  vector<long long> POW(T + 1);
  POW[0] = 1;
  for (int i = 1; i <= T; i++){
    POW[i] = POW[i - 1] * Q % MOD;
  }
  vector<long long> f(T + 1, 0);
  vector<long long> g(T + 1, 0);
  f[0] = 1;
  long long p = 1;
  for (int i = 1; i <= T + 1; i++){
    g[i - 1] = p;
    if (i > T){
   	  break;
    }
    f[i] = (MOD - p * P % MOD) % MOD;
    p *= POW[i];
    p %= MOD;
  }
  vector<long long> finv = inverse(f);
  vector<long long> h = atcoder::convolution(finv, g);
  cout << h[T] << endl;
}