using System;
using System.Linq;

    public class Program
    {
        public static void Main()
        {
            int[] point = Console.ReadLine().Split(' ').Select(x => Convert.ToInt32(x)).ToArray();
            Array.Sort(point);
            Console.WriteLine(Math.Min(point[2] - point[1] + point[2] - point[0], point[2] - point[1] + point[1] - point[0]));

        }
    }