#include <stdio.h>

int factorial(int x) {
  return(0);
}


int main(int argc, char **argv) {
  int num;
  if (argc>1) {
	num = atoi(argv[1]);
	printf("%d! = %d\n",num,factorial(num));
  } else {
	printf("You have to give me a number!\n");
  }
  return(1);
}