import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	double m = sc.nextInt();
    	int n = sc.nextInt();
    	for (int i = 0; i < n; i++) {
    	    m = m * 2 / 3 + (m + 1) / 3;
    	}
    	System.out.println(m);
	}
}