import sys
readline = sys.stdin.readline

def Matprod(A, B, mod):
    N = len(A)
    temp = [[0] * N for i in range(N)]
    for i in range(N):
        for j in range(N):
            for k in range(N):
                temp[i][j] += A[i][k] * B[k][j]
                temp[i][j] %= mod
    return temp

def Matpow(A, M, mod):
    N = len(A)
    Mat = [[0] * N for i in range(N)]
    for i in range(N):
        Mat[i][i] = 1
         
    for i in range(65):
        if (M >> i) & 1:
            Mat = Matprod(Mat, A, mod)
        A = Matprod(A, A, mod)
    return Mat

N, M, K, p, q = map(int, readline().split())
mod = 10 ** 9 + 7
B = []
for i in range(N):
    B.append(int(readline()))

A = [[q - p, p], [p, q - p]]
inv = pow(q, mod - 2, mod)
A = Matpow(A, K, mod)
ans = A[0][0] * sum(B[:M]) * pow(inv, K, mod) % mod
ans += A[0][1] * (sum(B) - sum(B[:M])) * pow(inv, K, mod) % mod
ans %= mod
print(ans)