#include <iostream>
#include<cstdio>

int main(){
 unsigned long long N;
 std::cin >> N;
 unsigned long long A = 1;
 bool over = 0;
 if(N >= 9765625) std::cout << "000000000000" << std::endl;
 else{
  for(unsigned long long i = 2; i <= N; i++){
   if(A * i > 1000000000000) over = 1, A*= i, A %= 1000000000000;
   else A *= i;
  }
  printf((over? "%12d": "%d"), A);
 }
}