#include <iostream>
#include <fstream>
#include <cstring>
#include <stack>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
const int INF = 1e9;
int n, m;
int v[100100], best[100100], previous[100100], small[100100];
stack<int> ans;
pair<int, int> binarySearch(int value, int left, int right)
{
int mid;
while(left <= right)
{
mid = (left + right) / 2;
if(v[small[mid]] < value)
left = mid + 1;
else
right = mid - 1;
}
return {left, small[left]};
}
int main()
{
in >> n;
for(int i = 1; i <= n; i++)
in >> v[i];
v[0] = INF;
small[1] = 1;
previous[1] = -1;
for(int i = 2; i <= n; i++)
{
pair<int, int> x = binarySearch(v[i], 1, i - 1);
best[i] = x.first;
previous[i] = x.second;
if(v[small[best[i]]] > v[i])
small[best[i]] = i;
if(best[i] > best[m])
m = i;
}
out << best[m] << '\n';
/*while(m != -1)
{
ans.push(v[m]);
m = previous[m];
}
while(!ans.empty())
{
out << ans.top() << ' ';
ans.pop();
}*/
return 0;
}