using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var input = Console.ReadLine().Split().Select(int.Parse).ToArray();
        var A = input[0];
        var B = input[1];
        var C = input[2];
        var ans = 0;

        var list = new List<int>(input);
        if (list.Distinct().Count() == 3)
            if (!((list.Max() == A && list.Min() == C) || (list.Max() == C && list.Min() == A)))
            {
                var temp = list.OrderByDescending(x => x).ToList();
                var p = temp[0] - temp[1];
                var q = temp[1] - temp[2];
                ans = p < q ? p : q;
            }
        Console.WriteLine(ans);
    }
}