#include "bits/stdc++.h"
#define in std::cin
#define out std::cout
#define rep(i,N) for(LL i=0;i<N;++i)
typedef long long int LL;

int main()
{
	LL N, M;
	in >> N >> M;

	if (N >= M)
	{
		out << 0 << std::endl;
		return 0;
	}
	LL ans = 1;
	for (LL i = 1; i <= N; ++i) (ans *= i % M) %= M;
	out << ans << std::endl;
}