// Calcolo di N!

#include <iostream>
#include <fstream>
using namespace std;

int main() {

  int N, i = 1;
  double fat = 1.;
  
  cout << "Calcolo di N!" << endl;
  cout << "Inserire un numero intero positivo: N = ";
  cin  >> N;
  
  if ( N < 0 ) {
    cout << "N < 0 ==> Esco" << endl;
    return -1;
  }
  
  for ( i = 2; i <= N; i++) {
    fat = fat * double(i);
    cout << fat << endl;
  }
  cout << N << "! = " << fat << endl;
  
  return 0;

}