// Program to compute the factorial of a positive integer.
// It is assumed that N is positive ( N >= 0 )
#include <iostream>
using namespace std;
int main () {

  unsigned int i, n;
  unsigned long factorial=1;

  cout << "Input N: ";
  cin >> n;

  for (i=2; i<=n; i++) factorial *= i;

  cout << n << " N! = " << factorial << endl;

}