import java.util.Scanner;

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

        System.out.println("Введите первое число:");
        int num1 = Integer.parseInt(scanner.nextLine());

        System.out.println("Введите знак операции (+, -, *, /):");
        String operation = scanner.nextLine();

        System.out.println("Введите второе число:");
        int num2 = Integer.parseInt(scanner.nextLine());

        Calculator calculator = new Calculator();
        try {
            int result = calculator.calculate(num1, operation, num2);
            System.out.println("Результат: " + result);
        } catch (ArithmeticException e) {
            System.out.println("Ошибка: " + e.getMessage());
        } catch (IllegalArgumentException e) {
            System.out.println("Ошибка: " + e.getMessage());
        }
    }
}

public class Calculator {
    public int calculate(int num1, String operation, int num2) {
        int result = 0;
        switch (operation) {
            case "+":
                result = num1 + num2;
                break;
            case "-":
                result = num1 - num2;
                break;
            case "*":
                result = num1 * num2;
                break;
            case "/":
                if (num2 == 0) {
                    throw new ArithmeticException("Деление на 0 недопустимо");
                }
                result = num1 / num2;
                break;
            default:
                throw new IllegalArgumentException("Неверный знак операции");
        }
        return result;
    }
}