using System;
using System.Linq;

class Sample {
  static void Main(string[] args) {
    int[] N = Console.ReadLine().Trim()
                                .Split(' ')
                                .Select(int.Parse)
                                .ToArray();
    double count = 0;
    var n = Math.Pow(2, N[1]);
    if (N[1] == 0) {
      count = Math.Pow(2, N[0]);
    } else {
      for (var i = n; i <= Math.Pow(2, N[0]); i+=n) {
        count += 1;
      }
    }
    Console.WriteLine(count);
  }
}