#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int p1, p2, q1, q2, t;
    cin >> p1 >> p2 >> q1 >> q2 >> t;
    mint p = mint(p1)/mint(p2);
    mint q = mint(q1)/mint(q2);
    mint dp[t+1];
    dp[0] = 1;
    mint ans = 0;
    for(int i=0;i<=t;i++){
        mint now = dp[i];
        mint Q = q;
        dbg((dp[i]*16).val());
        for(int j=i+1;j<=t;j++){
            dp[j] += now * p;
            now *= Q;
            Q *= q;
        }
        dbg((now*32).val());
        ans += now;
    }
    cout<<ans.val()<<endl;
    return 0;
}