using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        Array.Sort(a);
        var ans = Min(a[2] - a[1], a[1] - a[0]);
        Console.WriteLine(ans);
    }
}