#include<iostream>
#include<fstream>

using namespace std;

#include "Stack.cpp"
ifstream in("input.txt");
ofstream out("output.txt");
int main()
{
	Stack<double> t, t2;
	int i, n;
	double k = 0, s = 0;
	while (in >> i)
	{
		t.Push(i);
	}
	in.close();
	while (!t.Empty())
	{
		n = t.Pop();
		if (n % 2 == 0)
		{
			k++;
			s += n;
			t2.Push(n);
		}
	}
	double ss = 0;
	ss = s / k;
	t2.Push(ss);
	while (!t2.Empty())
	{
		cout << t2.Pop() << ' ';
	}
	//out << endl;
	//out << "sredarf = " << ss;
	system("pause");
	return 0;
}