#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = long long;
using std::cout;
using std::endl;
using std::cin;

template<typename T>
std::vector<T> make_v(size_t a){return std::vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

int main() {
	int x, y, z; scanf("%d%d%d", &x, &y, &z);

	int ans = 0;
	for(int i = 0; i <= z; i++) {
		int A = x + i, B = y + (z - i);

		ans = std::max(ans, std::min(A, B));
	}
	printf("%d\n", ans);
	return 0;
}