import java.io.*;
import java.util.Scanner;

import java.io.IOException;
import java.util.StringTokenizer;

public class Main {

    static class Task {

        class MyScanner {
            BufferedReader br;
            StringTokenizer st;

            public MyScanner(String inputFile) {
                try {
                    br = new BufferedReader(new InputStreamReader(new FileInputStream(new File(inputFile))));
                } catch (Exception e) {

                }

            }

            String next() {
                while (st == null || !st.hasMoreElements()) {
                    try {
                        st = new StringTokenizer(br.readLine());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                return st.nextToken();
            }

            int nextInt() {
                return Integer.parseInt(next());
            }

            long nextLong() {
                return Long.parseLong(next());
            }

            double nextDouble() {
                return Double.parseDouble(next());
            }

            String nextLine(){
                String str = "";
                try {
                    str = br.readLine();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return str;
            }
        }

        public final static String INPUT_FILE = "scmax.in";
        public final static String OUTPUT_FILE = "scmax.out";

        int n;
        int[] numere;

        private void readInput() {
            try {
                MyScanner sc = new MyScanner(INPUT_FILE);
                n = sc.nextInt();
                numere = new int[n + 1];
                numere[0] = 0;
                for (int i = 1; i <= n; i++) {
                    numere[i] = sc.nextInt();
                }
                //sc.close();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

        private void writeOutput(int result) {
            try {
                PrintWriter pw = new PrintWriter(new File(OUTPUT_FILE));
                pw.printf("%d\n", result);
                pw.close();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        private int findMax(int current, int indice, int[] dp) {
            int max = 1;
            for (int i = 1; i <= indice; i++) {
                if (numere[i] < current) {
                    if (dp[i] + 1 > max) {
                        max = dp[i] + 1;
                    }
                }
            }
            return max;
        }

        private int getResult() {
            // TODO: Aflati punctajul maxim pe care il puteti obtine
            // planificand optim temele.
            int[] dp = new int[n + 1];
            dp[1] = 1;
            int maxGlobal = -1;

            for (int i = 2; i <= n; i++) {
                int current = numere[i];
                int max = findMax(current, i - 1, dp);
                dp[i] = max;
                if (max > maxGlobal) {
                    maxGlobal = max;
                }
            }

            return maxGlobal;
        }

        public void solve() {
            readInput();
            writeOutput(getResult());
        }
    }

    public static void main(String[] args) {
        new Task().solve();
    }
}