#include<bits/stdc++.h>
using namespace std;
using ll = long long;
template<class T> using vt = vector<T>;
template<class T> using vvt = vector<vt<T>>;
template<class T> using ttt = tuple<T,T>;
using tii = tuple<int,int>;
using vi = vector<int>;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define pb push_back
#define mt make_tuple
#define ALL(a) (a).begin(),(a).end()
#define FST first
#define SEC second
#define DEB cerr<<"!"<<endl
#define SHOW(a,b) cerr<<(a)<<" "<<(b)<<endl
#define DIV int(1e9+7)
const int INF = (INT_MAX/2);
const ll LLINF = (LLONG_MAX/2);
const double eps = 1e-8;
//const double PI = M_PI;  
inline ll pow(ll x,ll n,ll m){ll r=1;while(n>0){if((n&1)==1)r=r*x%m;x=x*x%m;n>>=1;}return r%m;}
inline ll lcm(ll d1, ll d2){return d1 / __gcd(d1, d2) * d2;}
 
/* Coding space */
int main(){
  ll n; cin >> n;
  ll ans = 1;
  int flag = 0;
  while(n != 0){
    if(ans == 0 || n >= 100){
      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;
}