import java.util.*;

public class _11053 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[] Arr = new int[N];
        for(int i=0; i<N; i++) Arr[i] = sc.nextInt();
        sc.close();

        int[] dp = new int[N];
        Arrays.fill(dp, 1);

        for(int i=0; i<N; i++) {
            for(int j=0; j<i; j++) {
                if(Arr[i]>Arr[j]) dp[i] = Math.max(dp[i], dp[j] + 1);
            }
        }

        int maxLenth = Arrays.stream(dp).max().getAsInt();
        System.out.println(maxLenth);
    }
}