#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = (n)-1; i >= 0; --i)
#define chmax(a, b) a = max(a, b)
#define chmin(a, b) a = min(a, b)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    VI a(n);
    rep(i, n) cin >> a[i];
    sort(all(a));
    multiset<int> m;
    for(int x: a) {
        auto it = m.lower_bound(x - 1);
        if (it != m.begin()) {
            it--;
            m.erase(it);
        }
        m.insert(x);
    }
    cout << m.size() << endl;
}