#include "bits/stdc++.h"
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
// https://codeforces.com/blog/entry/79148
class Timer: chrono::high_resolution_clock {
const time_point start_time;
public:
Timer(): start_time(now()) {}
rep elapsed_time() const {
return chrono::duration_cast<chrono::milliseconds>(now() - start_time).count();
}
} timer;
int main() {
cin.tie(0);
ios::sync_with_stdio(0);
int n, x;
cin >> n >> x;
vector<int> a(n);
set<int> s;
for (int i = 0; i < n; i++) {
cin >> a[i];
auto it = s.lower_bound(a[i]);
if (it != s.end()) {
s.erase(it);
}
s.insert(a[i]);
}
cout << s.size();
return 0;
}
