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

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] A = new int[3];
		for (int i = 0; i < 3; i++) {
			A[i] = sc.nextInt();
		}

		Arrays.sort(A);

		int sum = 0;
		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