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

int main()
{
	int i = 10;
	int j = 20;

	int temp1;
	{
		int a = i;
		int b = j;
		temp1 = (a + b) / 2;
	}
	int k = temp1;

	int temp2;
	{
		int a = j;
		int b = 40;
		temp2 = (a + b) / 2;
	}
	cout << temp2 << "\n";

	return EXIT_SUCCESS;
}