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

public class Main {

	static Scanner scanner;
	static int[] C;
	static int[][] A;
	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

	    int[] a=new int[3];
	    a[0]=gi();
	    a[1]=gi();
	    a[2]=gi();
	    Arrays.parallelSort(a);
        System.out.println(a[2]-a[0]);
//        if (a<b) {
//        	System.out.print(Math.max(b-a-w, 0));
//        }else {
//        	System.out.print(Math.max(a-b-w, 0));
//        }


	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
}
/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