import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int y = sc.nextInt();
        
		if(x == 0 && y == 0){
        System.out.println(0);
    	}else if(x == 0 && y == 1 || x == 1 && y == 0 || x == 1 && y == 1){
    		System.out.println(1);
		}else{
			System.out.println(2);
		}
    }
}