#include <bits/stdc++.h>

#include <atcoder/convolution>
#include <atcoder/modint>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
void fast_io() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
}

vector<mint> f, g, h;
int n;
void calc(int l1, int r1, int l2, int r2) {
    while (h.size() < r1 + r2 - 1) {
        h.push_back(0);
    }
    vector<mint> f1, f2;
    for (int i = l1; i < r1; i++) {
        f1.push_back(f[i]);
    }
    for (int i = l2; i < r2; i++) {
        f2.push_back(g[i]);
    }
    vector<mint> fg = convolution(f1, f2);
    for (int i = 0; i < fg.size(); i++) {
        h[i + l1 + l2] += fg[i];
    }
}

mint append(mint a, mint b) {
    f.push_back(a);
    g.push_back(b);
    n++;
    int m = (n + 1) & -(n + 1);
    int s = 0;
    if (m <= n) {
        int add = 1;
        while (add <= m) {
            calc(n - add, n, s, s + add);
            calc(s, s + add, n - add, n);
            s += add;
            add <<= 1;
        }
    } else {
        int add = 1;
        while (add < (m >> 1)) {
            calc(n - add, n, s, s + add);
            calc(s, s + add, n - add, n);
            s += add;
            add <<= 1;
        }
        calc(n - add, n, s, s + add);
    }
    return h[n - 1];
}
int main() {
    fast_io();
    int pp1, pp2, qq1, qq2, t;
    cin >> pp1 >> pp2 >> qq1 >> qq2 >> t;
    mint p = mint(pp1) / pp2, q = mint(qq1) / qq2;
    vector<mint> qpow(t + 1, 1);
    for (int i = 1; i <= t; i++) {
        qpow[i] = qpow[i - 1] * q;
    }
    vector<mint> birth(t + 2), remain(t + 2);
    birth[0] = 1;
    mint la_q = 1;
    for (int i = 1; i <= t + 1; i++) {
        remain[i] = append(birth[i - 1], la_q);
        la_q *= qpow[i];
        birth[i] = remain[i] * p;
    }
    cout << remain[t + 1].val() << endl;
}