using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Programming
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] str = Console.ReadLine().Split();
            int N = int.Parse(str[0]);
            int M = int.Parse(str[1]);
            int[] C = Console.ReadLine().Split().Select(int.Parse).ToArray();
            //------------

            Array.Sort(C);
            int i=0;
            while (M > 0)
            {
                C[i]--;
                if (C[i] == 0)
                {
                    i++;
                }

                M--;
            }

            Console.WriteLine(i);
        }
    }
}