#ifdef NACHIA
#define _GLIBCXX_DEBUG
#else
#define NDEBUG
#endif
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <array>
#include <cmath>
#include <atcoder/modint>
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(i64 i=0; i<(i64)(n); i++)
#define repr(i,n) for(i64 i=(i64)(n)-1; i>=0; i--)
const i64 INF = 1001001001001001001;
const char* yn(bool x){ return x ? "Yes" : "No"; }
template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; }
template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; }
template<typename A> using nega_queue = std::priority_queue<A,std::vector<A>,std::greater<A>>;
using Modint = atcoder::static_modint<998244353>;
//#include "nachia/vec.hpp"
using namespace std;

void testcase(){
    i64 p1, p2, q1, q2, t; cin >> p1 >> p2 >> q1 >> q2 >> t;
    Modint p = Modint(p1) / Modint(p2);
    Modint q = Modint(q1) / Modint(q2);
    vector<Modint> F;
    F.push_back(1);
    rep(i,t){
        vector<Modint> A(F.size()+1);
        rep(d,F.size()){
            A[0] += F[d] * p;
            A[d+1] += F[d] * q.pow(d+1);
        }
        swap(A, F);
    }
    Modint ans = 0;
    for(auto a : F) ans += a;
    cout << ans.val() << endl;
}

int main(){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    #ifdef NACHIA
    int T; cin >> T; for(int t=0; t<T; T!=++t?(cout<<'\n'),0:0)
    #endif
    testcase();
    return 0;
}