#include<bits/stdc++.h>
using namespace std;

int main(){
  int A,B,C;
  cin >> A >> B >> C;
  if(A>C){
    swap(A,C);
  }
  if(max({A,B,C})==B){
    cout << B-C << endl;
  }
  else{
    cout << A-B << endl;
  }
}