using System.Numerics;

public class Program
{
    public static void Main()
    {

        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;


        string a = str[0];
        string b = str[1];

        if(a ==b && a =="0")
        {
            Console.WriteLine(0);
        }
        else if(a == b && a != "0" || a== "0"&&b != "0"|| b == "0"&&a != "0")
        {
            Console.WriteLine(1);
        }
        else
        {
            Console.WriteLine(2);
        }

    }
}