import java.util.Arrays;
import java.util.Scanner;

public class Main {

	Scanner sc = new Scanner(System.in);

	void run() {
		int n = sc.nextInt();
		int[] a = new int[n];
		for (int i = 0; i < n; i++)
			a[i] = sc.nextInt();

		int max = 0;
		int[] dp = new int[n];
		for (int i = 0; i < n; i++) {
			dp[i] = 1;
			for (int j = 0; j < i; j++) {
				if (a[j] < a[i]) {
					dp[i] = Math.max(dp[i], dp[j] + 1);
				}
			}
			max = Math.max(dp[i], max);
		}
		System.out.println(max);
	}

	public static void main(String[] args) {
		new Main().run();
	}
}