#yuki995
mod=10**9+7
n,m,k,p,q=map(int,input().split())
b=[int(input()) for i in range(n)]
e=(pow(q,k,mod)+pow(q-2*p,k,mod))%mod
o=(pow(q,k,mod)-pow(q-2*p,k,mod))%mod
x=0
for i in range(m):
 x+=e*b[i]
 x%=mod
for i in range(m,n):
 x+=o*b[i]
 x%=mod
y=(2*pow(q,k,mod))%mod
r=(x*pow(y,mod-2,mod))%mod
print(r)