# タピオカ美味しくなーる
N, M, K, P, Q = map(int, input().split())
value = [int(input()) for i in range(N)]
mod = 10**9 + 7


def rev(X):
    return pow(X, mod-2, mod)


up = 0
down = 2*pow(Q, K, mod)
for i in range(N):
    if i < M:
        up += value[i]*(pow(Q, K, mod)+pow(Q-2*P, K, mod))
        up %= mod
    else:
        up += value[i]*(pow(Q, K, mod)-pow(Q-2*P, K, mod))
ans = up*rev(down) % mod
print(ans)