04. Even Powers of 2

import java.util.Scanner;

public class p04 {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int n = Integer.parseInt(console.nextLine());
        int currNum = 1;
        double power2 = Math.pow(2, n);
        while (currNum <= power2 ){
            System.out.println(currNum);
            currNum *= 4;
        }
    }
}