#include <bits/stdc++.h>
using ll = long long;
int main()
{
    ll N, M;
    std::cin >> N>> M;
    if(N >= M){return std::cout <<0<<std::endl,0;}
    ll ans = 1;
    for(ll i = 1; i<=N;i++){(ans*=i)%=M;}
    std::cout << ans << std::endl;
    return 0;
}