#include <stdio.h>

long fact(int k)
{
  if (k == 0)
    return 1;
  else
    return k*fact(k-1);
}

int main()
{
  int n;
  int nf;

  printf("Enter n\n");
  scanf("%d",&n);

  nf = fact(n);
  
  printf("Factorial = %d\n",nf);

  system("pause");
  return(0);
}