#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
using namespace std;

int main(){
	int r,b,p;
	cin >> r >> b >> p;
	if(p>0){
		while(p){
			if(r>b){
				b++;
			}else{
				r++;
			}
			p--;
		}
	}
		cout << min(r,b) << endl;
		return 0;
}