import java.util.Arrays;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int[] a=new int[3];
		int[] b=new int[3];
		for(int i=0;i<3;i++)
			a[i]=sc.nextInt();
		b[0]=Math.abs(a[0]-a[1]);
		b[1]=Math.abs(a[1]-a[2]);
		b[2]=Math.abs(a[2]-a[0]);
		Arrays.sort(b);
		int ans=b[0]+b[1];
		System.out.println(ans);
	}
}
/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