import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        int sum;
        int num1, num2;
        boolean isNotCorrect;


        System.out.println("Снова сумма, гойда");

        num1 = 0;
        do {
            isNotCorrect = false;
            System.out.println("Введи число 1");
            try{
                num1 = Integer.parseInt(scan.nextLine());
            } catch(NumberFormatException exception) {
                isNotCorrect = true;
                System.out.println("Гойда, ошибка");
            }
        } while (isNotCorrect);

        num2 = 0;
        do {
            isNotCorrect = false;
            System.out.println("Введи число 2");
            try{
                num2 = Integer.parseInt(scan.nextLine());
            } catch(NumberFormatException exception) {
                isNotCorrect = true;
                System.out.println("Гойда, ошибка");
            }
        } while (isNotCorrect);

        sum = num1 + num2;

        System.out.println(sum);

    }
}