#include <bits/stdc++.h>

#include <atcoder/all>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace std;
using namespace atcoder;

typedef long long ll;
using mint = modint998244353;

int main() {
    int p1, p2, q1, q2, t;
    cin >> p1 >> p2 >> q1 >> q2 >> t;
    mint p = p1, q = q1;
    p /= p2, q /= q2;
    vector<vector<mint> > dp(t + 1, vector<mint>(t + 1));
    dp[0][0] = 1;
    rep(i, 0, t) {
        rep(j, 0, t) {
            dp[i + 1][0] += (mint)p * dp[i][j];
            dp[i + 1][j + 1] += (mint)q.pow(j + 1) * dp[i][j];
        }
    }
    mint ans = 0;
    rep(i, 0, t + 1) ans += dp[t][i];
    cout << ans.val() << endl;
}