import java.util.*;

public class Main {
  	static Scanner scanner = new Scanner(System.in);
  
	public static void main(String[]$) {
      	int a1 = scanner.nextInt(), a2 = scanner.nextInt(), a3 = scanner.nextInt();
    	System.out.println(Math.max(Math.max(a1, a2), a3) - Math.min(Math.min(a1, a2), a3));
    }
}
/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