def f(N, x, y):
    q, r = divmod(N, 4)
    v = pow(-4, q, mod)
    if r == 0:
        return v * x % mod
    elif r == 1:
        return v * 2 * x % mod
    elif r == 2:
        return v * 2 * (x - y) % mod
    else:
        return v * (-4) * y % mod

A, B, C, D = map(int, input().split())
N = int(input())
mod = 10 ** 9 + 7
ans = f(N, A, C)
q, r = divmod(N, 4)
if q % 2 == 0:
    print(f(N, B, C))
else:
    print(f(N, A, D))