#include <iostream>
#include <cstdio>
#include <vector>
#include <array>
#include <string>
#include <algorithm>
#include <numeric>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <limits>
#include <tuple>
#include <stack>
#include <bitset>
#include <cstring>
#include <sstream>
#include <functional>
#include <random>
#define int long long
using namespace std;
void solve() {
int n, x;
cin >> n >> x;
vector<int> a(n);
for (auto& e : a)
cin >> e;
vector<int> t;
for (auto& e : a) {
auto it = lower_bound(t.begin(), t.end(), e);
if (it == t.end())
t.push_back(e);
else
*it = e;
}
cout << t.size() << '\n';
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
solve();
return 0;
}
