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

namespace ForYukicoder
{
    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<int>();
            //------------

            Array.Sort<int>(C);

            int cnt = 0;
            while (M > 0)
            {
                for (int i = cnt; i < N; i++)
                {
                    C[i] = C[i] - 1;
                    M = M - 1;

                    if (C[i] == 0)
                    {
                        cnt = cnt + 1;
                    }
                }
            }

            Console.WriteLine(cnt);
        }
    }
}