import java.util.*;
 
public class Main
{
	public static void main(String args[])
	{
		Scanner sc=new Scanner(System.in);
		int a=sc.nextInt();
		int b=sc.nextInt();
		int c=sc.nextInt();
		
		int d=0,e=0,f=0;
		
		d=Math.abs(a-b);
		e=Math.abs(c-b);
		f=Math.abs(a-c);
		int aa=Math.max(d,e);
		System.out.println(Math.max(aa,f));
	}
}
/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