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

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