import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Sequence {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String[] input = scanner.nextLine().split(" ");
        int number = Integer.parseInt(input[0]);
        int targetNumber = Integer.parseInt(input[1]);

        List<Integer> list = new ArrayList<>();

        int group = 0;
        int result = 0;

        list.add(number);

        for (int i = 1; i < targetNumber; i++) {

            if (i % 3 == 1) {
                result = list.get(group) + 1;
                list.add(result);
                continue;
            } else if (i % 3 == 2) {
                result = 2 * list.get(group) + 1;
                list.add(result);
                continue;
            } else {
                result = list.get(group) + 2;
                list.add(result);
            }
            group++;
        }

        System.out.println(list.get(targetNumber - 1));

//        System.out.println();
//
//        for (Integer elem : list) {
//            System.out.print(elem + " ");
//        }
    }
}