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import java.util.Scanner;class MyMath {    public int add(int a, int b) {        return a + b;    }    public int sub(int a, int b) {        return a - b;    }    public int mul(int a, int b) {        return a * b;    }    public int div(int a, int b) {        return a / b;    }}class MyMathTest {    public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        System.out.println("??????????");        int firstNumber = sc.nextInt();        System.out.println("??????????");        int secondNumber = sc.nextInt();        MyMath mm = new MyMath();        System.out.println("?????" + mm.add(firstNumber, secondNumber));        System.out.println("?????" + mm.sub(firstNumber, secondNumber));        System.out.println("?????" + mm.mul(firstNumber, secondNumber));        System.out.println("?????" + mm.div(firstNumber, secondNumber));    }}

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