On Time for Exam

import java.util.Scanner;

public class OnTimeForExam {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Integer hourExam = Integer.parseInt(scanner.nextLine());
        Integer minExam = Integer.parseInt(scanner.nextLine());
        Integer hourArrive = Integer.parseInt(scanner.nextLine());
        Integer minArrive = Integer.parseInt(scanner.nextLine());

        Integer totalMinExamTime = hourExam*60+minExam;
        Integer totalMinArriveTime = hourArrive*60+minArrive;
        Integer diffMinTime = Math.abs(totalMinExamTime-totalMinArriveTime);

        if(totalMinExamTime.equals(totalMinArriveTime)){
            System.out.println("On time");
        }else if(totalMinExamTime > totalMinArriveTime){
            if(diffMinTime<=30){
                System.out.println("On time");
                System.out.printf("%d minutes before the start",diffMinTime);
            }else {
                if(diffMinTime<60){
                    System.out.println("Early");
                    System.out.printf("%d minutes before the start",diffMinTime);
                }else{
                    Integer timeForHour = (int)Math.floor(diffMinTime/60);
                    Integer timeForMinutes = (diffMinTime%60);
                    if(timeForMinutes < 10){
                        System.out.println("Early");
                        System.out.printf("%d:0%d hours before the start",timeForHour, timeForMinutes);
                    }else{
                        System.out.println("Early");
                        System.out.printf("%d:%d hours before the start", timeForHour, timeForMinutes);
                    }
                }
            }
        }else{
            if(diffMinTime<=30){
                System.out.println("Late");
                System.out.printf("%d minutes after the start",diffMinTime);
            }else {
                if(diffMinTime<60){
                    System.out.println("Late");
                    System.out.printf("%d minutes after the start",diffMinTime);
                }else{
                    Integer timeForHour = (int)Math.floor(diffMinTime/60);
                    Integer timeForMinutes = (diffMinTime%60);
                    if(timeForMinutes < 10){
                        System.out.println("Late");
                        System.out.printf("%d:0%d hours after the start",timeForHour, timeForMinutes);
                    }else{
                        System.out.println("Late");
                        System.out.printf("%d:%d hours after the start", timeForHour, timeForMinutes);
                    }
                }
            }
        }
    }
}