import java.util.Scanner;

public class Main {

    static int N = 1010;
    static int[] f = new int[N];
    static int[] a = new int[N];



    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        for (int i = 1; i <= n; i ++ )
            a[i] = sc.nextInt();

        int max = 0;//记录最大值

        for (int i = 1; i <= n; i ++) {
            f[i] = 1; //找不到则为1
            for (int j = 1 ; j < i; j ++) {
                if (a[j] < a[i])    f[i] = Math.max(f[i], f[j] + 1);
            }

            max = Math.max(max, f[i]); //得到数组中的最大值
        }

        System.out.println(max);
    }
}