#include <iostream>

using namespace std;


int main()
{
	int x, z;
	cout << "x=";
	cin >> x;
	cout << "z=";
	cin >> z;
	int a = 5;

	if (x - a <= 3)
	{
		z = z + 2;
		if (x == a || x == 0)
		{
			a = a - 2;
			z = z - 2 * x;

		}
		else
		{
			z = (z - x)*a;
		}
		z = 7 * z - 3;
	}
	else
	{
		int n = 4 + 2 * a;
		for (int k = 1; k < n; k++)
		{
			z = k - 4 * x*z;
			if (x < a + 7)
			{
				z = z + 3 * k;
			}
		}
	}
	cout << "z=" << z << endl;


	system("pause");
	return 0;
}