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

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int[] costArray = { scanner.nextInt(), scanner.nextInt(), scanner.nextInt() };
		Arrays.sort(costArray);
		int ans = 0 + Math.abs(costArray[1] - costArray[0]) + Math.abs(costArray[2] - costArray[1]);
		System.out.println(ans);
		scanner.close();
	}
}
/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