#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
#include <list>

using namespace std;

typedef long long ll;

#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
#define ctos(d) string(1,d)
#define print(x) cout<<#x<<" = "<<x<<endl;

#define MOD 1000000007

int main() {
  long long n;
  cin>>n;
  if(n<=14){
    long long ans = 1;
    rep(i,1,n+1){
      ans *= i;
    }
    cout << ans << endl;
  }
  else{
    long long ans = 1;
    rep(i,1,min(100LL,n+1)){
      ans *= i;
      ans %= 1000000000000LL;
    }
    printf("%012lld\n",ans);
  }
  return 0;
}