#include <bits/stdc++.h>
using namespace std;

#define all(x) (x).begin(),(x).end()
#define SP <<" "<<
#define MOD 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000

typedef long long LL;
typedef long double LD;

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