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

namespace To4kaVarhuOtse4ka_PointOnSegment_
{
    class Program
    {
        static void Main(string[] args)
        {
            var firstNum = int.Parse(Console.ReadLine());
            var secondNum = int.Parse(Console.ReadLine());
            var point = int.Parse(Console.ReadLine());

            var firstP = 0;
            var secondP = 0;

            var secondDiff = 0;
            var firstDiff = 0;
            if (firstNum<secondNum)
            {
                firstP = firstNum;
                secondP = secondNum;
            }
            else
            {
                firstP = secondNum;
                secondP = firstNum;
            }
            if (point>=firstP&&point<=secondP)
            {
                Console.WriteLine("in");
                secondDiff = secondP - point;
                firstDiff = point - firstP;

                if (firstDiff>secondDiff)
                {
                    Console.WriteLine(secondDiff);
                }
                else
                {
                    Console.WriteLine(firstDiff);
                }
            }
            if (point<firstP || point>secondP)
            {
                Console.WriteLine("out");
                secondDiff = Math.Abs(secondP - point);
                firstDiff = Math.Abs(point - firstP);
                if (firstDiff>secondDiff)
                {
                    Console.WriteLine(secondDiff);
                }
                else
                {
                    Console.WriteLine(firstDiff);
                }
            }
        }
    }
}