#include <cstdio> #include <cstring> #include <iostream> #include <string> #include <cmath> #include <bitset> #include <vector> #include <map> #include <set> #include <queue> #include <deque> #include <algorithm> #include <complex> #include <unordered_map> #include <unordered_set> #include <random> #include <cassert> #include <fstream> #define popcount __builtin_popcount using namespace std; typedef long long int ll; typedef pair<ll, ll> P; int main() { ll n, m; cin>>n>>m; if(n>=m){ cout<<0<<endl; }else{ ll ans=1; for(ll i=1; i<=n; i++){ ans*=i; ans%=m; } cout<<ans<<endl; } return 0; }