#include <fstream>
using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

const int MAX_LENGTH = 100000;

int main() {
    int numLen;
    fin >> numLen;
    int nums[MAX_LENGTH + 1];
    for (int i = 1; i <= numLen; ++i) {
        fin >> nums[i];
    }
    int maxSubsequenceLen[MAX_LENGTH + 1], answer = 0;
    maxSubsequenceLen[0] = 0;
    for (int i = 1; i <= numLen; ++i) {
        int maxLen = 0, maxLenPos = 0;
        for (int j = 1; j < i; ++j) {
            if (maxSubsequenceLen[j] > maxLen && nums[j] < nums[i]) {
                maxLen = maxSubsequenceLen[j];
                maxLenPos = j;
            }
        }
        maxSubsequenceLen[i] = maxSubsequenceLen[maxLenPos] + 1;
        answer = max(maxSubsequenceLen[i], answer);
    }
    fout << answer;
    return 0;
}