#include <iostream>
#include <vector>
#include <atcoder/modint>
using namespace std;

using mint = atcoder::modint998244353;

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