import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int x = a;
		int b = sc.nextInt();
		int y = b;
		if(b > a) {
			x = b;
			y = a;
		}
		int c = sc.nextInt();
		int z = c;
		if(c > x) {
			z = y;
			y = x;
			x = c;
		}else if(c > y) {
			z = y;
			y = c;
		}

		System.out.println((x-y)+(y-z));


	}
}
/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