ProgBasicsJavaBook3.1SimpleConditions14TimePlus15Minutes

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int hours = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());
        int results = (hours * 60 + (minutes + 15));
        minutes = results % 60;
        hours = results / 60;
        if (hours == 24 && minutes < 10) {
            System.out.printf("0:0%d", minutes);
        } else if (hours == 24) {
            System.out.printf("0:%d", minutes);
        } else if (minutes < 10) {
            System.out.printf("%d:0%d", hours, minutes);
        } else {
            System.out.printf("%d:%d", hours, minutes);
        }
    }
}