#include<iostream>
#include<cmath>
using namespace std;

int main() {
  int a, b, s;
  cin >> a >> b >> s;

  int ans;


  if((a > s && s > b) || (b > s && s > a)) {
    if(abs(s-a) < abs(s-b)) {
      ans = s + a;
    } else {
      ans = b + 1;
    }
  }else {
    if(a > s) ans = a;
    else ans = s;
  }

  cout << ans << endl;
  return 0;
}