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);
}