import java.util.*;

public class Main {
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int A1 = sc.nextInt();
		int A2 = sc.nextInt();
		int A3 = sc.nextInt();
		
		int A12 = Math.abs(A1 - A2);
		int A13 = Math.abs(A1 - A3);
		int A23 = Math.abs(A2 - A3);
		int cost = Math.min(Math.min(A12 + A23, A13 + A23), A12 + A13);
		System.out.println(cost);
	}
}
/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