import java.util.Scanner;

public class first {
    public static int dajiegou(int a,int b,int answer2){
        int c;
        if (answer2 == 1) {
            c = a + b;
            return c;
        }
        if (answer2 == 2) {
            c = a - b;
            return c;
        }
        if (answer2 == 3) {
            c = a * b;
            return c;
        }
        if (answer2 == 4) {
            c = a % b;
            return c;
        }
        return 1;}}
/*  public static void main(String[] args) {
        int a, b, c = 0,w=0,i=0;
        Scanner scan = new Scanner(System.in);
        for(i=0;;i++){
        a = scan.nextInt();
        b = scan.nextInt();
        System.out.println("which means do you want to use?1 for +;2 for -;3 for *;4 for %;");
        int answer1 = scan.nextInt();
        if (answer1 == 1) {
            c = a + b;
        }
        if (answer1 == 2) {
            c = a - b;
        }
        if (answer1 == 3) {
            c = a * b;
        }
        if (answer1 == 4) {
            c = a % b;
        }
        System.out.println("the result is:" + c);
        System.out.println("do you want continue?1 for Y;01 for N");
        w=scan.nextInt();
    if(w==0)break;}
    }*/
//}

/*
public class first{
    public static void main(String[] args){
        int i =5;
        int j =6;
        int sum = add(i,j);
        System.out.println(sum);

        sum =0;
        for(i=0;i<100;i++)
            sum += i;
        System.out.println(sum);
    }
    public static int add(int augend,int addend){
        int sum = augend + addend;
        return sum;
    }
}*/
/*
public class first{
    public static String numberchange(int grade){
        if (grade < 60)
            return("不及格");
        else if(grade < 70)
            return("及格");
        else if (grade < 80)
            return("中等");
        else if (grade < 90)
            return("良好");
        else if (grade <= 100)
            return("优秀");
        else return("错误");
    }
}*/