#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <cmath>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <functional>
#include <iomanip>
#include <bitset>
#include <cassert>
using namespace std;
typedef long long ll;

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