N,M,K,p,q = map(int,input().split())
b = [int(input()) for _ in range(N)]
P = 10 ** 9 + 7
r = p * pow(q,P-2,P) % P
R = [[1-r,r],[r,1-r]]
e = [[1,0],[0,1]]
def seki(x,y):
    l = [[0] * 2 for _ in range(2)]
    for i in range(2):
        for j in range(2):
            for k in range(2):
                l[i][j] += x[i][k] * y[k][j] % P
            l[i][j] %= P
    return l
while K:
    if K & 1:
        e = seki(e,R)
    R = seki(R,R)
    K >>= 1
s = sum(b[:M])
t = sum(b) - s
ans = e[0][0] * s + e[0][1] * t
print(ans %P)