#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;

vector<vector<mint>> dp;
vector<vector<int>> memo;
mint rec(int t, int x, mint p, mint q) {
    if(memo[t][x]) {
        return dp[t][x];
    }
    if(t == 0) {
        return 1;
    }
    mint ret = p * rec(t - 1, 1, p, q) + q.pow(x) * rec(t - 1, x + 1, p, q);
    memo[t][x] = 1;
    return dp[t][x] = ret;
}

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;
    dp.resize(2000), memo.resize(2000);
    rep(i, 2000) dp[i].resize(2000);
    rep(i, 2000) memo[i].resize(2000);
    cout << rec(t, 1, p, q).val() << endl;
    return 0;
}