How do you get this code to allows the input of quarters and dollar bills?

How do you get this code to allows the input of quarters and dollar bills?

I was given an assignment where I have to use a java code given to me and
I have to allow the input of quarters and as well as the input to dollar
bills but I do not how to do that. So is there any way to do that. Here is
my code: package vendingmachine1;
import java.util.Scanner;
/**
*
* @author Link
*/
public class VendingMachine1
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
final int PENNIES_PER_DOLLAR=100;
final int PENNIES_PER_QUARTER=25;
System.out.print("Enter bill value(1 = $ 1 bill, 5 = $ 5 bill,etc.):");
int billValue = in.nextInt();
System.out.print("Enter the price in pennies:");
int itemPrice= in.nextInt();
// Compute change due
int changeDue = PENNIES_PER_DOLLAR*billValue-itemPrice;
int dollarCoins =changeDue/PENNIES_PER_DOLLAR;
changeDue = changeDue%PENNIES_PER_DOLLAR;
int quarters =changeDue/PENNIES_PER_QUARTER;
// Print change due
System.out.printf("Dollar coins:% 6d",dollarCoins);
System.out.println();
System.out.printf("Quarters: %6d",quarters);
System.out.println();
}
private static class of {
public of() {
}
}
}