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

inline int average(int a, int b)   //function declaration and definition
{
	return (a + b) / 2;
}

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

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