import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int m=sc.nextInt();
        if(m>1){
            System.out.println(n+m-1);
        }
            else
            {
            System.out.println(n-m);
        
            }/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}