import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] numbers = new int[3];
		int task = 0;
		for(int a = 0 ; a < 3 ; a++){
			numbers[a] = sc.nextInt();
		}
		sc.close();
		Arrays.sort(numbers);
		task = Math.abs(numbers[0] - numbers[1]) + Math.abs(numbers[1] - numbers[2]);
		System.out.println(task);
	}
}
/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