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

public class Main {

	public static void main(String ars[]) {

		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int sum = 0;

		int[] A = {a,b,c};

		Arrays.sort(A);

		for(int i = 1; i < A.length; i++){
			sum += A[i] - A[i-1];
		}

		System.out.println(sum);

	}

}

/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