#include <iostream>
using namespace std;
const int N = 1010;
int f[N] ,a[N];
int main() {
int n;
cin >> n;
for (int i = 1; i<= n; ++i) {
cin >> a[i];
}
for (int i = 1; i <= n; ++i) {
f[i] = 1;
for (int j = 1; j < i; ++j) {
if (a[j] < a[i]) {
f[i] = max(f[i], f[j] + 1);
}
}
}
int res = 0;
for (int i = 1; i <= n; ++i) {
res = max(res, f[i]);
}
cout << res << endl;
}