#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001


int main(){
	
	ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	
	mint p,q;
	{
		int p1,p2;
		cin>>p1>>p2;
		p = p1;
		p /= p2;
	}
	{
		int q1,q2;
		cin>>q1>>q2;
		q = q1;
		q /= q2;
	}
	
	int T;
	cin>>T;

	vector<mint> dp(T+1);
	dp[0] = 1;
	for(int i=1;i<=T;i++){
		mint sum = 1;
		for(int j=i-1;j>=0;j--){
			sum *= q.pow(i-j-1);
			mint cur = 1;
			cur *= sum;
			cur *= dp[j];
			cur *= p;
			dp[i] += cur;
		}
	}
	mint ans = 0;
	mint sum = 1;
	for(int i=T;i>=0;i--){
		sum *= q.pow(T-i);
		mint cur = 1;
		cur *= dp[i];
		cur *= sum;
		ans += cur;
	}
	cout<<ans.val()<<endl;
	
	return 0;
}