import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

 class Main 
 {

    public static void main(String[] args) 
    {
        Scanner sc=new Scanner(System.in);
        
        int a[]=new int[3];
        for(int i=0;i<3;i++)
        {
           a[i]=sc.nextInt();
        }
        
        Arrays.sort(a);
        int sum=0;
        for(int i=1;i<=2;i++)
        {
            int diff=a[i]-a[i-1];
            sum=sum+diff;
        }
        System.out.println(sum);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz