#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

# %%
import numpy as np
# from numba import njit

# %%
N, M, K, p, q = map(int, readline().split())
B = np.array(read().split(), np.int64)

# %%
MOD = 10 ** 9 + 7
q_inv = pow(q, MOD - 2, MOD)
p_stay = 1 + pow((q - p - p) * q_inv, K, MOD)
p_stay *= pow(2, MOD - 2, MOD)
p_stay %= MOD

# %%
x = B[:M].sum() % MOD
y = B[M:].sum() % MOD
answer = p_stay * x + (1 - p_stay) * y
answer %= MOD
print(answer)

# %%