#include "bits/stdc++.h"

using namespace std;

void solve()
{
	int n, m;
	cin >> n >> m;
	if (n >= m)
	{
		cout << 0 << endl;
		return;
	}
	int ans = 1;
	for (int i = 2; i <= n; i++)
	{
		ans *= i;
		ans %= m;
	}
	cout << ans << endl;
}

int main()
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}