N, M, K, p, q = map(int, input().split())
b = [int(input()) for _ in range(N)]
mod = 10**9+7

move = (p*pow(q,mod-2,mod))%mod
nmove = ((q-p)*pow(q,mod-2,mod))%mod
inv = pow(2,mod-2,mod)
res = 0
p = pow(nmove-move,K,mod)
for i in range(M):
    res += (b[i]*(1+p)*inv)%mod
    res %= mod
for i in range(M,N):
    res += (b[i]*(1-p)*inv)%mod
    res %= mod
print(res)