A, B, C, D = map(int, input().split())
N = int(input())
MOD = 10 ** 9 + 7

if (N + 1) % 8 <= 4:
    a0 = B
else:
    a0 = A

if (N - 1) % 8 <= 4:
    b0 = C
else:
    b0 = D

def matmul(X, Y):
    ret = [[0] * 2 for i in range(2)]
    for i in range(2):
        for j in range(2):
            for k in range(2):
                ret[i][j] = (ret[i][j] + X[i][k] * Y[k][j]) % MOD
    return ret

def matpow(X, n):
    ret = [[0] * 2 for i in range(2)]
    ret[0][0] = 1
    ret[1][1] = 1
    while n > 0:
        if n % 2:
            ret = matmul(ret, X)
        X = matmul(X, X)
        n >>= 1
    return ret

ret = matpow([[1, -1],[1, 1]], N)
ans = ret[0][0] * a0 + ret[0][1] * b0 + ret[1][0] * a0 + ret[1][1] * b0
print(ans % MOD)