N,M,K,p,q = map(int, input().split())
B = [int(input()) for _ in range(N)]

mod = 10**9+7
even = (pow(q, K, mod)+pow(q-2*p, K, mod)) % mod
odd = (pow(q, K, mod)-pow(q-2*p, K, mod)) % mod

x = 0
for i in range(M):
    x += even*B[i]
    x %= mod
for i in range(M, N):
    x += odd*B[i]
    x %= mod

y = (2*pow(q, K, mod))%mod
R = (x*pow(y, mod-2, mod))%mod
print(R)