Scanner user_input = new Scanner(System.in);

    System.out.print("Enter your first number: ");
    int first_num = user_input.nextInt();

    System.out.print("Enter your second name: ");
    int second_num = user_input.nextInt();

    System.out.print("Enter your third name: ");
    int third_num = user_input.nextInt();

    int sum = 0;

    if( (first_num == -1) || (second_num == -1) || (third_num == -1) ){
        System.out.println(" ");
        System.out.println("You cannot enter -1 !! ");
    }

    else if( (first_num % 2 == 0) || (second_num % 2 == 0) || (third_num % 2 == 0) ){
        sum = first_num + second_num + third_num;
        System.out.println(" ");
        System.out.println("The total is " + sum);
    }