#include <iostream>
using namespace std;
int main() {
	int n, m;
	cin >> n >> m;
	if (n >= m) {
		cout << 0 << endl;
	}
	else {
		int ans = 1;
		for (int i = 1; i <= n; ++i) {
			ans = 1LL * ans * i % m;
		}
		cout << ans << endl;
	}
	return 0;
}