package timus;
import java.util.Scanner;
/**
* Created by sherxon on 12/8/16.
*/
// not solved
public class CityBlocks1139 {
public static void main(String[] args) {
Scanner in =new Scanner(System.in);
int n=in.nextInt()-1;
int m=in.nextInt()-1;
if(m==n) System.out.println(m);
else{
}
}
}