mod = 10 ** 9 + 7

a, b, c, d = map(int, input().split())
n = int(input())

a *= pow(16, n // 8, mod)
b *= pow(16, n // 8, mod)
c *= pow(16, n // 8, mod)
d *= pow(16, n // 8, mod)

if n % 8 == 0:
    print((b + c) % mod)
elif n % 8 == 1:
    print(2 * b % mod)
elif n % 8 == 2:
    print((2 * b - 2 * c) % mod)
elif n % 8 == 3:
    print((4 * c) % mod)
elif n % 8 == 4:
    print(-4 * (a + c) % mod)
elif n % 8 == 5:
    print(-8 * a % mod)
elif n % 8 == 6:
    print((8 * d - 8 * a) % mod)
elif n % 8 == 7:
    print((8 * d) % mod)