import java.util.*;

public class Exercise35{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    int a = sc.nextInt();
    int b = sc.nextInt();

    if (a < b){
      System.out.println(a -1);
    }else if(b < a){
      System.out.println(2000000000 - a);
    }
  }
}