a 를 2b배 만큼 곱한 값을 출력한다.
import java.io.IOException;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws IOException {
Scanner scan = new Scanner(System.in);
int a = scan.nextInt();
int b = scan.nextInt();
int pow = (int) Math.pow(2, b);
System.out.println(a*pow);
}
}