#include <atcoder/all>
#include <bits/stdc++.h>
using ll = long long;
using ull = unsigned long long;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define REP(i, m, n) for(int i = (int)(m); i < (int)(n); i++)
using namespace std;
using namespace atcoder;
using mint = modint998244353;
const int inf = 1000000007;
const ll longinf = 1ll << 60;

namespace fps {
using P = vector<mint>;

void dft(P &f) {
    atcoder::internal::butterfly(f);
}

void idft(P &f) {
    atcoder::internal::butterfly_inv(f);
    mint c = mint(f.size()).inv();
    for(auto &e : f)
        e *= c;
}
P inv(P &f, int size = -1) {
    assert(f[0] != 0);
    if(size == -1) {
        size = f.size();
    }
    P g(size);
    g[0] = f[0].inv();
    for(int d = 1; d < size; d <<= 1) {
        P gg(2 * d), ff(2 * d);
        for(int j = 0; j < min((int)f.size(), 2 * d); j++)
            ff[j] = f[j];
        for(int j = 0; j < d; j++) {
            gg[j] = g[j];
        }

        dft(ff);
        dft(gg);
        for(int j = 0; j < 2 * d; j++)
            ff[j] *= gg[j];
        idft(ff);

        for(int j = 0; j < d; j++) {
            ff[j] = 0;
        }
        dft(ff);
        for(int j = 0; j < 2 * d; j++)
            ff[j] *= gg[j];
        idft(ff);

        for(int j = d; j < min(2 * d, size); j++)
            g[j] = -ff[j];
    }
    return g;
}
} // namespace fps
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int p1, p2, q1, q2, t;
    cin >> p1 >> p2 >> q1 >> q2 >> t;
    mint p = mint(p1) / p2;
    mint q = mint(q1) / q2;
    vector<mint> bumbo(t + 1), bunshi(t + 1);
    ll c = 0;
    rep(i, t + 1) {
        bumbo[i] = -p * q.pow(c);
        c += i;
        bunshi[i] = q.pow(c);
    }
    bumbo[0] = 1;
    auto ret = convolution(bunshi, fps::inv(bumbo));
    cout << ret[t].val() << endl;
    return 0;
}