import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a1 = sc.nextInt();
        int a2 = sc.nextInt();
        int a3 = sc.nextInt();
        int ans = 1000;
        ans = Math.min(ans, Math.abs(a1 - a2) + Math.abs(a1 - a3));
        ans = Math.min(ans, Math.abs(a2 - a1) + Math.abs(a2 - a3));
        ans = Math.min(ans, Math.abs(a3 - a1) + Math.abs(a3 - a2));
        System.out.println(ans);
    }
}
/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