#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <math.h> 
using namespace std;

int main(int argc, char *argv[] )
{
  //calculated the factorial
  int n,i,ans;
    if(argc>1){
      n=(int)atof(argv[1]);
    }
    else{
      n = 1;
    }
    i=1;
    ans=i;
    while(i<=n){
      ans=ans*i;
      cout << i << "\t" << ans << endl;
      i++;
      //i++ is same as i=i+1 
    }
      cout << n<<"! = "<<ans << endl;
      return 0;
}