import java.util.*;

public class Main {
	public static void main(String[] args) {  
  		Scanner sc = new Scanner(System.in);
      	int[] ary = new int[3];
      	for(int i = 0; i < ary.length; i++) {
        	ary[i] = sc.nextInt();
        }
      	Arrays.sort(ary);
      	System.out.println(
          (ary[1] - ary[0]) + (ary[2] - ary[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