import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int[] a = new int[4];
        int keep = 0;
        a[0] = 0;
        a[1] = sc.nextInt();
        a[2] = sc.nextInt();
        a[3] = sc.nextInt();
        if(a[1]>a[2]){
            keep = a[1];
            a[1] = a[2];
            a[2] = keep;
        }
        if(a[2]>a[3]){
            keep = a[2];
            a[2] = a[3];
            a[3] = keep;
        }
        if(a[1]>a[2]){
            keep = a[1];
            a[1] = a[2];
            a[2] = keep;
        }
        System.out.println(a[3]-a[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