import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < 3; i++) list.add(sc.nextInt());

        List<Integer> sorted = list.stream().sorted(Comparator.naturalOrder()).collect(Collectors.toList());
        System.out.println((sorted.get(1)-sorted.get(0)) + (sorted.get(2)-sorted.get(1)));
    }
}

/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