import java.util.*;
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    Integer num[] = new Integer[3];
    num[0] = sc.nextInt();
    num[1] = sc.nextInt();
    num[2] = sc.nextInt();
    Arrays.sort(num, Collections.reverseOrder());
    System.out.println(Math.abs(num[0]-num[1])+Math.abs(num[2]-num[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