using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Magatro
{
    static void Main()
    {
        int[] AB = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();
        int cnt = 0;
        int A = AB[0];
        int B = AB[1];
        if (A < B)
        {
            cnt += A - 1;
            cnt += B - A - 1;
        }
        else
        {
            cnt += A - B - 1;
            cnt += 2000000000 - A;
        }
        Console.WriteLine(cnt);    
    }

}