//CalculatePennies.java

import java.util.Scanner;

public class CalculatePennies
{
    // Returns number of pennies if pennies are doubled numDays times
    public static long doublePennies
    (
        long numPennies,
        int numDays
    )
    {
        long totalPennies;

        /* Your solution goes here  */
        if (numDays < 1)
        {
           totalPennies = numPennies;
        }
        else
        {
            totalPennies = doublePennies((numPennies * 2), numDays - 1);
        }

        return totalPennies;
    }

    // Program computes pennies if you have 1 penny today,
    // 2 pennies after one day, 4 after two days, and so on
    public static void main (String [] args)
    {
        Scanner scnr = new Scanner(System.in);
        long startingPennies;
        int userDays;

        startingPennies = scnr.nextLong();
        userDays = scnr.nextInt();
        System.out.println
        (
            "Number of pennies after "
            + userDays
            + " days: "
            + doublePennies(startingPennies, userDays)
        );
    }
}