import sys

sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N,M,K,p,q = MI()
mod = 10**9+7
B = [I() for _ in range(N)]

b0 = sum(B[:M])
b1 = sum(B[M:])
b0 %= mod
b1 %= mod
r = p*pow(q,mod-2,mod)
r %= mod

ans = b0*(1+pow(1-2*r,K,mod))
ans %= mod
ans += b1*(1-pow(1-2*r,K,mod))
ans %= mod
print((ans*(mod+1)//2) % mod)