using System;

public class Program

{

    public static void Main()

    {

        string[] A=Console.ReadLine().Split();

        Array.Sort(A);

        int a=int.Parse(A[0]);

        int b=int.Parse(A[1]);

        int c=int.Parse(A[2]);

        int n=(a<b)?a:b;

        int m=(n<c)?n:c;

        int x=(a>b)?a:b;

        int y=(x>c)?x:c;

        Console.WriteLine(y-m);

    }

}