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

public class Main{
  public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int[] As = new int[3];
        As[0] = scanner.nextInt();
        As[1] = scanner.nextInt();
        As[2] = scanner.nextInt();

        int bestCost = 99999;
        for(int i = 0; i < 3;i++){

            for(int j = 0; j < 3;j++){
                if(j == i) continue;
                int sum = 3 - i - j;
                int a = Math.abs(As[j] - As[i]);
                a+=  Math.abs(As[sum] - As[j]);
                if(a < bestCost){
                    bestCost = a;
                }
            }

        }
        System.out.println(bestCost);
    }
}
/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