#include <iostream>

using namespace std;

int main()
{
	int x, y;
    
	cout << "Enter x = ";
	cin >> x;

	cout << "Enter y = ";
	cin >> y;

	while (x <= y+2)
	{
		cout << x << ", ";
		x = x * 2;
	}

	cout << endl;

	return 0;
}