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();
    int ans = -1;
    if(x == y) {
      ans = 0;
    } else if(y == 0) {
      ans = 1;
    } else if(x == 0) {
      ans = 2;
    } else if((x + y) == 0) {
      ans = 3;
    }
    System.out.println(ans);
  }
}