#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000100

int main(){
	
	int X,Y,Z;
	cin>>X>>Y>>Z;
	
	int ans = min(X,Y);
	X -= ans;
	Y -= ans;
	
	int k = max(X,Y);
	
	int o = min(k,Z);
	ans += o;
	Z -= o;
	
	ans += Z/2;
	cout<<ans<<endl;
	
    return 0;
}