import java.util.*;
class Main{
    public static void main(String[] args){
	Scanner stdIn=new Scanner(System.in);
	int[] S = new int[3];
	for(int i=0;i<3;i++){
	    S[i] = stdIn.nextInt();
	}
	Arrays.sort(S);
	int j =S[2]-S[1];
	int k =S[1]-S[0];
	System.out.println(j+k);
    }
}

/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