import java.util.*;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    int data[] = new int[3];

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

    Arrays.sort(data);

    int x = Math.abs(data[0] - data[1]);
    int y = Math.abs(data[1] - data[2]);
    System.out.println(x + y);
  }
}

/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