#include <bits/stdc++.h>
using namespace std;

long long mod = 998244353;
//入力が必ずmod未満の時に使う.
struct mint{
    long long v = 0;
    mint(){} mint(int a){v = a;} mint(long long a){v = a;} mint(unsigned long long a){v = a;}
    long long val(){return v;}
    void modu(){v %= mod;}
 
    mint repeat2mint(long long a,long long b){
        mint ret = 1,p = a;
        while(b){if(b&1) ret *= p; p *= p; b >>= 1;}
        return ret;
    };
 
    mint operator+(mint b){return (v+b.v)%mod;}
    mint operator-(mint b){return (v-b.v+mod)%mod;}
    mint operator*(mint b){return v*b.v%mod;}
    mint operator/(mint b){
        if(b.v == 0) assert(false);
        return v*(repeat2mint(b.v,mod-2)).v%mod;
    }
 
    void operator+=(mint b){v = (v+b.v)%mod;}
    void operator-=(mint b){v = (v-b.v+mod)%mod;}
    void operator*=(mint b){v = v*b.v%mod;}
    void operator/=(mint b){
    if(b.v == 0) assert(false);
        v = v*repeat2mint(b.v,mod-2).v%mod;
    }
 
    void operator++(int){v = (v+1)%mod; return;}
    void operator--(int){v = (v-1+mod)%mod; return;}
    bool operator==(mint b){if(v == b.v) return true; else return false;}
    bool operator!=(mint b){if(v != b.v) return true; else return false;}
    bool operator>(mint b){if(v > b.v) return true; else return false;}
    bool operator>=(mint b){if(v >= b.v) return true; else return false;}
    bool operator<(mint b){if(v < b.v) return true; else return false;}
    bool operator<=(mint b){if(v <= b.v) return true; else return false;}
 
    mint pow(long long x){return repeat2mint(v,x);}
    mint inv(){return mint(1)/v;}
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    mint p1,p2,q1,q2;
    cin >> p1.v >> p2.v >> q1.v >> q2.v;
    int T; cin >> T;

    mint P = p1/p2,Q = q1/q2;
    vector<mint> pq(T+1,1);
    for(int i=1; i<=T; i++) pq.at(i) = pq.at(i-1)*Q;

    mint answer = 0;
    vector<mint> time(T+1);
    time.at(0) = 1;
    for(int i=0; i<T; i++){
        mint alive = time.at(i);
        for(int k=i+1; k<=T; k++){
            time.at(k) += alive*P;
            alive *= pq.at(k-i);
        }
        answer += alive;
    }

    answer += time.at(T);
    cout << answer.v << endl;
}