Longest Ordered Subsequence
A numeric sequence of a_i is ordered if a_1 ≤ a_2 ≤ … ≤ a_N. Let the subsequence of the given numeric sequence (a_1, a_2, …, a_N) be any sequence (a_i1, a_i2, …, a_iK), where 1 ≤ i_1 < i_2 < … < i_K ≤ N. For example, the sequence (1, 7, 3, 5, 9, 4, 8) has ordered subsequences, e. g., (1, 7), (3, 4, 8) and many others. All longest ordered subsequences of this sequence are of length 4, e. g., (1, 3, 5, 8).
Your program, when given the numeric sequence, must find the length of its longest ordered subsequence.
Input
The first line of input file contains the length of sequence N (1 ≤ N ≤ 10^5). The second line contains the elements of sequence — N integers in the range from 0 to 10^6 each, separated by spaces.
Output
Output file must contain a single integer — the length of the longest ordered subsequence of the given sequence.