#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
const int mod = 1000000007;
const int INF = 1e18;

//YOU_ARE _GIVEN_TW O_INTEGE RS_N_AND_ M._YOU R_TASK_ IS_TO_FI ND_TH E_FACT ORIAL_O F_N,_MOD ULO_M.

signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    if(n >= m) cout << 0 << endl;
    else{
        int ans = 1;
        rep(i, 1, n + 1) ans = ans * i % m;
        cout << ans << endl;
    }
}