#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline double time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

template <int mod>
struct static_modint {
    using mint = static_modint;
    int x;

    static_modint() : x(0) {}
    static_modint(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}

    mint& operator+=(const mint& rhs) {
        if ((x += rhs.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator-=(const mint& rhs) {
        if ((x += mod - rhs.x) >= mod) x -= mod;
        return *this;
    }
    mint& operator*=(const mint& rhs) {
        x = (int) (1LL * x * rhs.x % mod);
        return *this;
    }
    mint& operator/=(const mint& rhs) { return *this = *this * rhs.inv(); }

    mint pow(long long n) const {
        mint _x = *this, r = 1;
        while (n) {
            if (n & 1) r *= _x;
            _x *= _x;
            n >>= 1;
        }
        return r;
    }
    mint inv() const { return pow(mod - 2); }

    mint operator+() const { return *this; }
    mint operator-() const { return mint() - *this; }
    friend mint operator+(const mint& lhs, const mint& rhs) {
        return mint(lhs) += rhs;
    }
    friend mint operator-(const mint& lhs, const mint& rhs) {
        return mint(lhs) -= rhs;
    }
    friend mint operator*(const mint& lhs, const mint& rhs) {
        return mint(lhs) *= rhs;
    }
    friend mint operator/(const mint& lhs, const mint& rhs) {
        return mint(lhs) /= rhs;
    }
    friend bool operator==(const mint& lhs, const mint& rhs) {
        return lhs.x == rhs.x;
    }
    friend bool operator!=(const mint& lhs, const mint& rhs) {
        return lhs.x != rhs.x;
    }

    friend ostream &operator<<(ostream &os, const mint &p) {
        return os << p.x;
    }
    friend istream &operator>>(istream &is, mint &a) {
        int64_t t; is >> t;
        a = static_modint<mod>(t);
        return (is);
    }
};

const unsigned int mod = 998244353;
using modint = static_modint<mod>;
modint mod_pow(ll n, ll x) { return modint(n).pow(x); }
modint mod_pow(modint n, ll x) { return n.pow(x); }

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    modint p1,p2,q1,q2; cin >> p1 >> p2 >> q1 >> q2;
    modint p = p1/p2;
    modint q = q1/q2;
    int T; cin >> T;
    vector<modint> save(T+2);
    save[0] = 1;
    modint res = 0;
    for (int i = 0; i <= T; ++i) {
        modint cur = save[i];
        for (int t = 1; t+i <= T; ++t) {
            save[t+i] += cur*p;
            cur *= mod_pow(q, t);
        }
        res += cur;
    }
    cout << res << endl;
}