#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
istream &operator>>(istream &is, modint &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint &a) { return os << a.val(); }
istream &operator>>(istream &is, modint998244353 &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint998244353 &a) { return os << a.val(); }
istream &operator>>(istream &is, modint1000000007 &a) { long long v; is >> v; a = v; return is; }
ostream &operator<<(ostream &os, const modint1000000007 &a) { return os << a.val(); } 

typedef long long ll;
typedef vector<vector<int>> Graph;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define FOR(i,l,r) for (int i = l;i < (int)(r); i++)
#define rep(i,n) for (int i = 0;i < (int)(n); i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define my_sort(x) sort(x.begin(), x.end())
#define my_max(x) *max_element(all(x))
#define my_min(x) *min_element(all(x))
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const int INF = (1<<30) - 1;
const ll LINF = (1LL<<62) - 1;
const int MOD = 998244353;
const int MOD2 = 1e9+7;
const double PI = acos(-1);
vector<int> di = {1,0,-1,0};
vector<int> dj = {0,1,0,-1};

#ifdef LOCAL
#  include <debug_print.hpp>
#  define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define debug(...) (static_cast<void>(0))
#endif

using mint = modint998244353;
// using mint = double;

int main(){
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    int P1, P2, Q1, Q2, T;
    cin >> P1 >> P2 >> Q1 >> Q2 >> T;
    mint p = mint(P1) / mint(P2);
    mint q = mint(Q1) / mint(Q2);

    vector dp(T + 1, vector<mint>(T + 1));
    dp[0][0] = 1;
    for(int i = 1; i <= T; i++){
        dp[i][0] = 0;
        for(int j = 0; j <= i; j++) dp[i][0] += dp[i - 1][j] * p;

        mint coef = 1;
        for(int j = 1; j <= T; j++){
            coef *= q;
            dp[i][j] = coef * dp[i - 1][j - 1];
        }
    }

    mint ans = 0;
    for(int j = 0; j <= T; j++) ans += dp[T][j];
    cout << ans << endl;
}