// package app;

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);

        int[] arr = new int[3];
        for (int i = 0; i < 3; i++) {
            arr[i] = sc.nextInt();
        }

        // int A1 = sc.nextInt();
        Arrays.sort(arr);

        System.out.println(Math.abs(arr[1] - arr[0]) + Math.abs(arr[2] - arr[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