import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int [] array = new int[3];
        for(int i = 0; i < 3; i++)
            array[i] = scan.nextInt();

        Arrays.sort(array);

        int sum = 0;
        for( int i = 1; i < 3; i++){
            sum += array[i] - array[i-1];
        }
        System.out.println(sum);
    }
}

/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