On time for the exam

import java.util.Scanner;

/**
 * Created by User on 17.8.2017 г..
 */
public class demo {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

       int examHour = Integer.parseInt(scanner.nextLine());
       int examMin = Integer.parseInt(scanner.nextLine());
       int arrivalHour = Integer.parseInt(scanner.nextLine());
       int arrivalMin = Integer.parseInt(scanner.nextLine());

       int examMinutes = examHour * 60 + examMin;
       int arrivalMinutes = arrivalHour * 60 + arrivalMin;

       int timeDiff = examMinutes - arrivalMinutes;

       if(timeDiff < 0){

           int hour = Math.abs(timeDiff) / 60;
           int mins = Math.abs(timeDiff) % 60;

           if (hour > 0){
               System.out.printf
                       ("Late\n%d:%02d hours after the start", hour, mins);
           }else{
               System.out.printf
                       ("Late\n%d minutes after the start",mins);
           }
       }if(timeDiff >= 0 && timeDiff <= 30 ){

            int mins = Math.abs(timeDiff) % 60;

            if(mins == 0) {
                System.out.println("On time");
            }else {
                System.out.printf("On time\n%d minutes before the start", mins);
            }
        }if(timeDiff > 30){

            int hour = Math.abs(timeDiff) / 60;
            int mins = Math.abs(timeDiff) % 60;

            if (hour > 0){
                System.out.printf
                        ("Early\n%d:%02d hours before the start", hour, mins);
            }else{
                System.out.printf
                        ("Early\n%d minutes before the start", mins);
            }
        }
    }
}