source_code: import java.math.BigInteger;
  import java.util.Scanner;
  
  public class RENAMETHISBITCH {
  		
  	public static void main(String[] args) {
  		
  		try (Scanner sc = new Scanner(System.in)) {
  			
  			int n = sc.nextInt();
  			BigInteger m = sc.nextBigInteger();
  			
  			System.out.println(m.mod(BigInteger.valueOf(2).pow(n)));
  		}
  		catch (Exception e) {
  			e.printStackTrace();
  		}
  	}
  }