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

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