import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int cost[] = new int[3];
		for(int i = 0; i < 3; i ++) {
			cost[i] = sc.nextInt();
		}
		Arrays.sort(cost);
		System.out.println(Math.abs(cost[0] - cost[2]));
	}
}
/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