import java.util.Arrays;
import java.util.Scanner;

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 = 0;

		int [] list = new int [] {A1, A2, A3};
		Arrays.sort(list);

		ans = (list[1] - list[0]) + (list[2] - list[1]) ;
		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