#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
 
using namespace std;
 
#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
 
#define MOD 1000000009

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