MOD = 10 ** 9 + 7

a, b, c, d = map(int, input().split())
n = int(input())
times = pow(16, n // 8, MOD)
n %= 8

max_ = -float("inf")
for xx in (a, b):
    for y in (c, d):
        x = xx
        for _ in range(n):
            x, y = x - y, x + y
        max_ = max(max_, x + y)
print(max_ * times % MOD)