Sum Seconds

import java.util.Scanner;

public class Sportisti {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        System.out.print("Vreme na sustezatel 1: ");
        int sustezatel1 = Integer.parseInt(scan.nextLine());
        proverka(sustezatel1);


        System.out.print("Vreme na sustezatel 2: ");
        int sustezatel2 = Integer.parseInt(scan.nextLine());
        proverka(sustezatel2);

        System.out.print("Vreme na sustezatel 3: ");
        int sustezatel3 = Integer.parseInt(scan.nextLine());
        proverka(sustezatel3);

        scan.close();
        System.out.println();

        int sum = sustezatel1 + sustezatel2 + sustezatel3;
        int minutes = Math.abs(sum / 60);
        int seconds = Math.abs(sum % 60);

        System.out.printf("Total time: %d:%02d", minutes, seconds);

    }
    public static void proverka(int vreme) {
        if (!(vreme > 0 && vreme <= 50)) {
            System.out.println();
            System.out.print("Invalid time");
            System.exit(0);
        }
    }
}