#include<bits/stdc++.h>
using namespace std;  
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define rep(i,n) for(ll i=0;i<(n);i++)  
#define pii pair<int,int>
#define piii pair<int,pii>
#define mp make_pair
#define pb push_back  
#define ALL(a) (a).begin(),(a).end()
#define FST first
#define SEC second  
const int INF = (INT_MAX/2);
const ll LINF = (LLONG_MAX/2);
const double eps = 1e-14;
const double PI = M_PI;  
#define DEB cout<<"!"<<endl
#define SHOW(a,b) cout<<(a)<<" "<<(b)<<endl
#define SHOWARRAY(ar,i,j) REP(a,i)REP(b,j)cout<<ar[a][b]<<((b==j-1)?((a==i-1)?("\n\n"):("\n")):(" "))
  
#define DIV 1000000007

int main(){
  ll n; cin >> n;
  ll ans = 1;
  int flag = 0;
  while(n != 0){
    if(ans == 0){
      cout << "000000000000" << endl;
      return 0;
    }
    ans *= n;
    if(ans >= 1000000000000){
      ans %= 1000000000000;
      flag++;
    }
    n--;
  }
  
  if(flag)
    cout <<setw(12) << setfill('0') << ans << endl;
  else
    cout << ans << endl;
  
  return 0;
}