#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
#define bupol __builtin_popcount
#define int long long
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;
const int MAXN = 3e5+20;
const int LOG = 60;
const int MOD = 998244353;
const int SQRT = 520;
const int INF = 1e18;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;
int n, x;
int a[MAXN];
vector <int> vec;
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin >> n >> x;
for(int i=1; i<=n; i++) cin >> a[i];
for(int i=1; i<=n; i++){
auto it = lower_bound(vec.begin(), vec.end(), a[i]);
if(it == vec.end()){
vec.pb(a[i]);
} else {
int id = it - vec.begin();
vec[id] = a[i];
//cout << i << ' '<< id << " id\n";
}
//for(auto in : vec) cout << in << ' ';
//cout << " vec\n";
}
cout << vec.size() << '\n';
}
