MOD = 10 ** 9 + 7
INF = 10 ** 10
import sys
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)

def main():
    n,m,k,p,q = map(int,input().split())
    lb = 0
    for _ in range(m):
        lb += int(input())
    rb = 0
    for _ in range(n - m):
        rb += int(input())
    
    key1 = pow(q,k,MOD)
    key2 = pow(q - 2 * p,k,MOD)

    x = (key1 + key2) * lb + (key1 - key2) * rb
    x %= MOD

    y = 2 * key1
    y %= MOD

    ans = (x * pow(y,MOD - 2,MOD))%MOD
    print(ans)

if __name__ =='__main__':
    main()