import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int[] arr = new int[3];
        for (int i = 0; i < 3; ++i) {
            arr[i] = in.nextInt();
        } Arrays.sort(arr);
        int ans = 0;
        for (int i = 1; i < 3; ++i) {
            ans += Math.abs(arr[i] - arr[i - 1]);
        }

        System.out.println(ans);
    }


}
/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