source_code: import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  
  public class Test3 {
  	public static void main(String[] args) throws NumberFormatException, IOException {
  		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  		int x=Integer.parseInt(br.readLine());
  		int y=Integer.parseInt(br.readLine());
  		System.out.print((int)(y%(Math.pow(2, x))));
  	}
  }
  