#include <stdio.h>

void pay_amount(int dollars, int *twenties, int *tens, int *fives, int *ones);

int main(void) {
	int dollars, twenties, tens, fives, ones;
	printf("Enter a dollar amount: ");
	scanf("%d", &dollars);
	pay_amount(dollars, &twenties, &tens, &fives, &ones);
	printf("\n$20 bills: %d\n$10 bills: %d\n $5 bills: %d\n $1 bills: %d",
			twenties, tens, fives, ones);

	return 0;

}

void pay_amount(int dollars, int *twenties, int *tens, int *fives, int *ones)  {

	*twenties = dollars / 20;
	dollars -= *twenties * 20;
	*tens = dollars / 10;
	dollars -= *tens * 10;
	*fives = dollars / 5;
	dollars -= *fives * 5;
	*ones = dollars;
}