On Time for The Exam

import java.util.Scanner;

public class primeri {
    public static void main(String[] args) {
        Scanner scanner = new Scanner (System.in);
        int hourOfExam = Integer.parseInt(scanner.nextLine());
        int minuteOfExam = Integer.parseInt(scanner.nextLine());
        int hourOfArrival = Integer.parseInt(scanner.nextLine());
        int minuteOfArrival = Integer.parseInt(scanner.nextLine());

        if (hourOfExam == hourOfArrival && minuteOfExam == minuteOfArrival){
            System.out.println("On time");
        }else if (hourOfArrival < hourOfExam || (minuteOfArrival <= minuteOfExam && hourOfArrival <= hourOfExam)){
            int allMinutesOfExam = (hourOfExam * 60) + minuteOfExam;
            int allMinuteesOfArrival = (hourOfArrival * 60) + minuteOfArrival;
            int timeBefore30min = allMinutesOfExam - 30;
            int time = allMinutesOfExam - allMinuteesOfArrival;
            if (allMinuteesOfArrival < allMinutesOfExam && allMinuteesOfArrival >= timeBefore30min) {
                System.out.println("On Time");
                    if (time < 60) {
                        System.out.printf("%d minutes before the start", time);
                    } else{
                        int b = time / 60;
                        int c = time % 60;
                        if (c < 10) {
                            System.out.printf("%d:0%d hours before the start",b,c);
                        } else
                            System.out.printf("%d:%d hours before the start",b,c);
                    }

            } else {
                System.out.println("Early");
                if (time < 60) {
                    System.out.printf("%d minutes before the start", time);
                } else{
                    int b = time / 60;
                    int c = time % 60;
                    if (c < 10) {
                        System.out.printf("%d:0%d hours before the start",b,c);
                    } else
                        System.out.printf("%d:%d hours before the start",b,c);
                }

            }

        } else {
            System.out.println("Late");
            int allMinutesOfExam = (hourOfExam * 60) + minuteOfExam;
            int allMinutesOfArrival = (hourOfArrival * 60) + minuteOfArrival;
            if (allMinutesOfArrival - allMinutesOfExam < 60)
                System.out.printf("%d minutes after the start", allMinutesOfArrival - allMinutesOfExam);
            else {
                int a = allMinutesOfArrival - allMinutesOfExam;
                int b = a/60;
                int c = a%60;
                if(c<10){
                    System.out.printf("%d:0%d hours after the start",b,c);
                }else
                    System.out.printf("%d:%d hours after the start",b,c);
            }
        }
    }
}