#include <bits/stdc++.h>
using namespace std;
#define fr first
#define sc second
#define int long long
#define all(x) (x).begin(), (x).end()
const int maxn = 2e5 + 5;
const long long inf = 1e18 + 5;
vector<int> tr(4*maxn), v(maxn);
void update(int node, int l, int r, int pos, int x) {
if(l == r) {
tr[node] = x;
return;
}
int mid = (l+r)/2, lc = 2*node + 1, rc = 2*node + 2;
if(pos <= mid) update(lc, l, mid, pos, x);
else if(pos > mid) update(rc, mid + 1, r, pos, x);
tr[node] = max(tr[lc], tr[rc]);
}
int query(int node, int l, int r, int ll, int rr) {
if(l > rr || r < ll) {
return -1;
}
if(l >= ll && r <= rr) {
return tr[node];
}
int mid = (l+r)/2, lc = 2*node + 1, rc = 2*node + 2;
return max(query(lc, l, mid, ll, rr), query(rc, mid + 1, r, ll, rr));
}
int32_t main() {
ios::sync_with_stdio(false);
cin.tie(NULL);
int n;
cin >> n;
for(int i = 1; i <= n; i++) {
cin >> v[i];
}
vector<int> aux;
aux = v;
sort(all(aux));
aux.erase(unique(all(aux)), aux.end());
for(int i = 1; i <= n; i++) {
v[i] = lower_bound(all(aux), v[i]) - aux.begin() + 1;
}
for(int i = 1; i <= n; i++) {
int max_dp = query(0, 1, n, 1, v[i] - 1);
update(0, 1, n, v[i], max_dp + 1);
}
cout << query(0, 1, n, 1, n);
return 0;
}
