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

signed main(){
  int a, b, s; cin >> a >> b >> s;
  if( abs( a - s ) <= abs( b - s ) ){
    cout << abs( a - s ) + s << endl;
  } else{
    cout << abs( b - s ) + s << endl;
  }
  return 0;
}