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

class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String[] strs = br.readLine().split(" ");
    int[] nums = new int[3];
    
    for (int i = 0; i < strs.length; i++) {
      nums[i] = Integer.parseInt(strs[i]);
    }
    Arrays.sort(nums);
    System.out.println((nums[2] - nums[1]) + (nums[1] - nums[0]));
    
  }
}
/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