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

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		
		int[] nums = new int[3];
		
		for(int i=0; i<nums.length; i++) {
			nums[i] = sc.nextInt();
		}
		
		Arrays.sort(nums);
		
		int cost = 0;
		
		cost = 0 + Math.abs(nums[1] - nums[0]) + Math.abs(nums[2] - nums[1]);
		System.out.println(cost);
	}
	
}

/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