
import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner scan = new Scanner(System.in);
		
		int a[] = new int[3], cost = 0;
		for (int i = 0; i < 3; i++)
		{
			a[i] = scan.nextInt();
		}
		scan.close();
		java.util.Arrays.sort(a);
		cost += a[1] - a[0];
		cost += a[2] - a[1];
		System.out.println(cost);
	}
}


/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