#include <iostream>
using namespace std;

int main()
{
	double x[5];
	int y;

	for (y = 0; y < 5; y++)
	   x[y] = y * 3;
	y = 3;

	cout << x[4] << endl;
	cout << x[0] << endl;
	cout << x[1] + 2.0 << endl;
	cout << x[(1+1)*2] << endl;
	cout << x[int(x[1])] << endl;
	cout << x[++y] << endl;
}