using System;
using System.Linq;

namespace _365
{
    class Program
    {
        public static int LowerBound(int[] arr,int value)
        {
            int low = 0;
            int high = arr.Length;
            int mid;
            while (low < high)
            {
                mid = ((high - low) / 2) + low;
                if (arr[mid] < value)
                    low = mid + 1;
                else
                    high = mid;
            }
            return low;
        }
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] x = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int[] dp = new int[n];
            for (int i = 0; i < n; i++) dp[i] = 1000000000;
            for (int i = 0; i < n; i++)
            {
                dp[LowerBound(dp,x[i])] = x[i];
            }
            Console.WriteLine(n - LowerBound(dp,1000000000));
        }
    }
}