import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a1 = sc.nextInt();
		int a2 = sc.nextInt();
		int a3 = sc.nextInt();

		List<Integer> absList = new ArrayList<Integer>();
		absList.add(Math.abs(a1 - a2));
		absList.add(Math.abs(a2 - a3));
		absList.add(Math.abs(a3 - a1));
		Collections.sort(absList);

		System.out.println(absList.get(0) + absList.get(1));

		sc.close();
	}
}
/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