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

const int64_t mod = 1000000007;

int64_t power(int64_t n, int64_t k) {
    if (k == 0) return 1;
    int64_t ans = power(n * n % mod, k / 2);
    if (k % 2) ans = ans * n % mod;
    return ans;
}

int main() {
    int64_t n, m, k, p, q, s0 = 0, s = 0;
    cin >> n >> m >> k >> p >> q;
    for (int i = 0; i < n; i++) {
        int64_t b;
        cin >> b;
        s += b;
        if (i < m) s0 += b;
    }
    s %= mod;
    s0 %= mod;
    int64_t shalf = s * ((mod + 1) / 2) % mod, d = (s0 - shalf + mod) % mod;
    int64_t pq = (2 * mod + 1 - 2 * p * power(q, mod - 2)) % mod;
    cout << (shalf + d * power(pq, k)) << endl;
}