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

signed main(){
  int a, b, s; cin >> a >> b >> s;
  if( abs( a - s ) <= abs( b - s ) or s == 1 ){
    cout << abs( a - s ) + s << endl;
  } else{
    int ans = 0;
    for( int i = 1; i <= s; ++i )
      ans = min( ans, abs( b - s ) + abs( s - i ) + abs( a - i ) + i );
    cout << ans << endl;
  }
  return 0;
}