#include <cstdio>
#include <climits>
#include <cmath>
#include <iostream>
#include <iomanip>
#include <string>
#include <cstdio>
#include <climits>
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <utility>
#include <queue>
#include <cstring>
#include <set>
#include <map>
#include <complex>
#define rep(i, n) for (int i = 0; i < int(n); i++)
using namespace std;
long long MOD = 1000000007;
long long INF = 1000000000000000; //10^15
typedef long long ll;
typedef unsigned long long ull;

ll powMod(ll x, ll n, ll mod) {
  if (x < 0) {
    if (n & 1) return -powMod(-x, n, mod);
    return powMod(-x, n, mod);
  }
  if (n == 0) return 1LL;
  ll t = powMod(x, n/2, mod);
  t *= t; t %= mod;
  if (n & 1) return x * t % mod;
  return t;
}


int main(void) {

  int n, m;
  ll k, p, q;
  ll b[100100];
  cin >> n >> m >> k >> p >> q;
  rep(i, n) cin >> b[i];

  ll x = 0, y = 0;
  rep(i, m) x += b[i];
  rep(i, n) y += b[i];
  y -= x;
  x %= MOD; y %= MOD;

  ll s, t;
  s = powMod(q, k, MOD); t =(powMod(q-2LL*p, k, MOD) + MOD) % MOD;

  ll u, v; // u/v
  u = (x * ((s + t) % MOD) % MOD + y * ((s - t) % MOD + MOD) % MOD) % MOD;
  v = 2LL * s % MOD;

  cout << u * powMod(v, MOD - 2LL, MOD) % MOD << endl;

  return 0;
}