#include <iostream>
#include <cstdlib>
using namespace std;

#define AVERAGE(a, b) (((a) + (b)) / 2)

int main()
{
	int i = 10;
	int j = 20;
	int k = AVERAGE(i, j);

	cout << AVERAGE(j, 40) << "\n";
	return EXIT_SUCCESS;
}