#include <iostream>
using namespace std;

long long N, M, s = 1;

int main() {
	cin >> N >> M;
	if (N >= M) {
		cout << "0" << endl;
		return 0;
	}
	for (int i = 1; i <= N; i++) { s *= i; s %= M; }
	cout << s << endl;
	return 0;
}