#include <bits/stdc++.h>
using namespace std;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using P = pair<ll, ll>;
const long double PI = acos(-1.0L);
ll GCD(ll a, ll b) { return b?GCD(b, a%b):a; }
ll LCM(ll a, ll b) { return a/GCD(a, b)*b; }

// auto mod int
const int mod = 1000000007;
// const int mod = 998244353;
struct mint {
    ll x; // typedef long long ll;
    mint(ll x=0):x((x%mod+mod)%mod){}
    mint operator-() const { return mint(-x);}
    mint& operator+=(const mint a) {
      if ((x += a.x) >= mod) x -= mod;
      return *this;
    }
    mint& operator-=(const mint a) {
      if ((x += mod-a.x) >= mod) x -= mod;
      return *this;
    }
    mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
    mint operator+(const mint a) const { return mint(*this) += a;}
    mint operator-(const mint a) const { return mint(*this) -= a;}
    mint operator*(const mint a) const { return mint(*this) *= a;}
    mint pow(ll t) const {
      if (!t) return 1;
      mint a = pow(t>>1);
      a *= a;
      if (t&1) a *= *this;
      return a;
    }

    // for prime mod
    mint inv() const { return pow(mod-2);}
    mint& operator/=(const mint a) { return *this *= a.inv();}
    mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}

int main() {
    ll n, m, k, p, q;
    cin >> n >> m >> k >> p >> q;
    ll bps = 0;
    for(int i = 0; i < m; ++i) {
        ll b; cin >> b;
        bps += b;
    }
    ll bls = 0;
    for(int i = 0; i < n-m; ++i) {
        ll b; cin >> b;
        bls += b;
    }
    mint bp = (mint)bps;
    mint bl = (mint)bls;
    mint mq = (mint)q;
    mint mp = (mint)p;
    mint mpq = mq-(mint)2*mp;

    mint R = ((bp+bl)*mq.pow(k) + (bp-bl)*mpq.pow(k)) / ((mint)2*mq.pow(k));
    cout << R << endl;
}