#include <iostream>
using namespace std;

int main() {
	int n, m, k = 1;
	cin >> n >> m;
	if ( n >= m) {
		cout << 0;
	}
	else {
		for ( int i = 2; i <= n; i++ ) {
			k = ( k * i ) % m;
		}
		cout << k; 
	}
	return 0; 
}