#include <iostream>
#include <cstdio>
#include <algorithm>

using namespace std;

int main() {
	int r, g, b;

	cin >> r >> g >> b;
	int made = min({r, g, b});
	int ans = 0;

	r -= made;
	g -= made;
	b -= made;
	ans += made;

	int x, y;
	if (r == 0) {
		x = g;
		y = b;
	} else {
		x = r;
		y = max(g, b);
	}

	if (x < y) {
		swap(x, y);
	}

	do {
		made = min(x / 3, y);
		x -= 3 * made;
		y -= made;
		ans += made;

		if (x < y) {
			swap(x, y);
		}
	} while (made > 0);

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