#include<bits/stdc++.h>
using namespace std;
int main()
{
	//freopen(".in", "r", stdin);
	//freopen(".out", "w", stdout);
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	int r, g, b, ans = 0;
	cin >> r >> g >> b;
	r = min(r, min(g, b));
	ans += r;
	g -= r;
	b -= r;
	ans += g / 3;
	ans += b / 3;
	cout << ans; 
	return 0;
}