#include <fstream>
using namespace std;

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

int n, x[100001], dp[100001];

void read()
{
	in >> n;
	for(int i = 1; i <= n; ++i)
		in >> x[i];
}

int best(int k)
{
	int b = 0;
	for(int i = k + 1; i <= n; ++i)
		if(x[k] < x[i])
			b = max(b, dp[i]);
	return b + 1;
}

void afis()
{
	int sol = 0;
	for(int i = 1; i <= n; ++i)
		sol = max(sol, dp[i]);
	out << sol;
}

int main()
{
	read();

	dp[n] = 1;
	for(int i = n-1; i > 0; --i)
		dp[i] = best(i);

	afis();
	return 0;
}