using namespace std;
#include <iostream>

int main () 
{
  int n,i;
  long long fact;
  cout << "dammi il numero > 0: ";
  cin >> n;

  i = 1;
  fact = 1;

  while (i<=n) {
    fact *= i;
    i++;
  }
  cout  << "Fact = "  << fact   << endl;

return 0;
}