#include <iostream>
#include <algorithm>
#include <sstream>
#include <cmath>

using namespace std;

int main(int argc, char *argv[])
{
	string s;
	int r, g, b;
	getline(cin, s);
	stringstream ss(s);
	ss >> r >> g >> b;
	int ans = min(r, min(g, b));
	int a[3] = { r - ans, g - ans, b - ans };
	sort(a, a + 3);
	int c = min(a[1], (a[2] - a[1]) / 2);
	ans += c;
	ans += (a[2] - c * 3) / 5;
	cout << ans << endl;
	return 0;
}