import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
	static int INF = (int)1e9 + 7;
	int N;
	int[] A,dp;
	public void solve() {
		N = nextInt();
		A = new int[N];
		dp = new int[N];

		for(int i = 0;i < N;i++){
			A[i] = nextInt();
		}

		Arrays.fill(dp, INF);

		for(int i = 0;i < N;i++){
			int left = 0;
			int right = N - 1;
			while(right - left > 1){
				int mid = ((right + left) >> 1);

				if(dp[mid] < A[i]){
					left = mid;
				}else{
					right = mid;
				}
			}
			dp[right] = Math.min(dp[right],A[i]);
		}
		int left = 0;
		int right = N - 1;
		while(right - left > 1){
			int mid  = ((right + left) >> 1);

			if(dp[mid] == INF){
				right = mid;
			}else{
				left = mid;
			}
		}

		out.println(left);
	}

	public static void main(String[] args) {
		out.flush();
		new Main().solve();
		out.close();
	}

	/* Input */
	private static final InputStream in = System.in;
	private static final PrintWriter out = new PrintWriter(System.out);
	private final byte[] buffer = new byte[2048];
	private int p = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (p < buflen)
			return true;
		p = 0;
		try {
			buflen = in.read(buffer);
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (buflen <= 0)
			return false;
		return true;
	}

	public boolean hasNext() {
		while (hasNextByte() && !isPrint(buffer[p])) {
			p++;
		}
		return hasNextByte();
	}

	private boolean isPrint(int ch) {
		if (ch >= '!' && ch <= '~')
			return true;
		return false;
	}

	private int nextByte() {
		if (!hasNextByte())
			return -1;
		return buffer[p++];
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = -1;
		while (isPrint((b = nextByte()))) {
			sb.appendCodePoint(b);
		}
		return sb.toString();
	}

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

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

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