#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);
	}

	// x 3,  y 1　で作る
	int diff = x - y;
	made = min(diff / 2, y);
	ans += made;
	x -= made * 3;
	y -= made;

	if (y == 0) {
		// x 5, y 0 で作る
		made = x / 5;
		x -= made * 5;
	} else {
		// (x 3, y 1) (x 1, y 3) の組み合わせで作る
		made = x / 4 * 2;
		x -= made * 2;
		y -= made * 2;

		if (x >= 3 && y >= 1) {
			made++;
		}
	}

	ans += made;
	cout << ans << endl;
	return 0;
}