#include <stdio.h>
#define DOLLARS_TO_DOUGHNUTS 12

/* function prototype */
void calculate_doughnuts ( int money);

int main()
{
	int dollars;
	
	printf("Enter number of whole dollars => ");
	scanf("%d", &dollars);
	 
	calculate_doughnuts ( dollars );
		
	return 0;
}
void calculate_doughnuts ( int money )
{
	int doughnuts = money * DOLLARS_TO_DOUGHNUTS;	
	printf("%d dollars can buy you %d doughnuts!\n", money, doughnuts);
}