Complete the following code snippet so that the output is "24/6/2021"?

Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 2021);
cal.set(Calendar.MONTH, _____);
cal.set(Calendar.DAY_OF_MONTH, 24);
System.out.println(cal.get(Calendar.DAY_OF_MONTH) + "/" + (cal.get(Calendar.MONTH) + 1) + "/" + cal.get(Calendar.YEAR));