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

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int a,b,s;
  cin>>a>>b>>s;
  Int ans=0;
  if(s==1||abs(a-s)<=abs(b-s)){
    ans=abs(a-s)+s;
  }else{
    ans=abs(b-s)+s-1+abs(a-1)+1;
    if(a) chmin(ans,abs(b-s)+abs(a-s)+a);
  }
  cout<<ans<<endl;
  return 0;
}