import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int[] aa = {scanner.nextInt(),scanner.nextInt(),scanner.nextInt()};
        
        Arrays.sort(aa);
        System.out.print((aa[2] - aa[1]) + (aa[1] - aa[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