JF-Lab04. Back In 30 Minutes

import java.util.Scanner;

public class BackIn30Minutes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int hour = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());
        int addMinutes = minutes + 30;
        if (addMinutes >59){
            addMinutes -= 60;
            hour++;
        }
        if (hour >23){
            hour -= 24;
        }
        System.out.printf("%d:%02d",hour,addMinutes);
    }
}