import functools


def product_mod(xs, m):
    return functools.reduce(lambda x, y: x * y % m, xs, 1) % m


def factorial_mod(n, m):
    return product_mod(range(1, n + 1), m)


def main():
    n, m = (int(z) for z in input().split())
    if n >= m:
        print(0)
    else:
        print(factorial_mod(n, m))


if __name__ == "__main__":
    main()