#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cstring>
#include<string>
#include<stack>
#include<queue>
#include<vector>
#include<algorithm>
#include <iomanip>
typedef long long int ll;
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define REP(i,n) for (int i=0;i<(n);i++)
#define EREP(i,n) for (int i=1;i<=(n);i++)
#define EVEL 1

#ifndef EVEL
#define DEB(X) cout << #X << ":" <<X<<" " ;
#define TF(f) f ? cout<<"true  " : cout<<"false ";
#define END cout<<"\n";
#else
#define DEB(X) {X=X;}
#define TF(f) {f=f;}
#define END {}
#endif
const int MOD = 1000000007;
const int INF = 1000000;
#define NMAX 50
#define MAX 10

 int main(){
     ll N,ans=1;
     ll md=1000000000000;
     cin>>N;
     if(N>=60){
         cout<<"000000000000";
         return 0;
     }
     for(int i=N;i>=1;i--){
         ans*=(i%md);
         ans%=md;
     }
     if(20<=N)printf("%012lld",ans);
     else{printf("%lld",ans);}

 }