#include "bits/stdc++.h"
using namespace std;
#define int long long
#define FOR(i, a, b) for(int i=(a);i<(b);i++)
#define RFOR(i, a, b) for(int i=(b-1);i>=(a);i--)
#define REP(i, n) for(int i=0; i<(n); i++)
#define RREP(i, n) for(int i=(n-1); i>=0; i--)
#define REP1(i, n) for(int i=1; i<=(n); i++)
#define RREP1(i, n) for(int i=(n); i>=1; i--)
#define ALL(a) (a).begin(),(a).end()
#define UNIQUE_SORT(l) sort(ALL(l)); l.erase(unique(ALL(l)), l.end());
#define CONTAIN(a, b) find(ALL(a), (b)) != (a).end()
#define out(...) printf(__VA_ARGS__)

int dxy[] = {0, 1, 0, -1, 0};

void solve();
signed main()
{
#if DEBUG
    std::ifstream in("input.txt");
    std::cin.rdbuf(in.rdbuf());
#endif
    cin.tie(0);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}

/*================================*/
#if DEBUG
#define SIZE 100
#else
#define SIZE 123450
#endif

int N,M,K,p,q;
int MOD=1e9+7;

int mod_pow(int b, int e, int m=MOD) {
    if (!e) return 1;
    int result = 1;
    b %= m;
    while (e > 0) {
        if ((e & 1) == 1) result = (result * b) % m;
        e >>= 1;
        b = (b * b) % m;
    }
    return result;
}

void solve() {
    cin>>N>>M>>K>>p>>q;
    int in = 0, ou = 0;
    int b;
    REP(i,N) {
        cin>>b;
        if (i<M) in += b;
        else ou += b;
    }
    in %= MOD;
    ou %= MOD;
    int iq = mod_pow(q, MOD-2);
    int i2 = mod_pow(2, MOD-2);
    int t = p*iq%MOD;
    int P = (mod_pow(1+(MOD-2)*t%MOD, K-1)*((-t+i2+MOD)%MOD)+i2)%MOD;
    int Q = (1-P+MOD)%MOD;
    int ans = in * P % MOD + ou * Q % MOD;
    cout << ans%MOD << endl;
}