#include <stdio.h>

#define WERT 15

int fakultaet(int x)
{
	if(x <= 1) return 1; /* Abbruchkriterium */
	return x * fakultaet( x-1 );
}

int main()
{
	printf("%d! = %d\n", WERT, fakultaet(WERT));
	return 0;
}