#include<bits/stdc++.h>
#define ll long long
#define F first
#define S second
using namespace std;
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int n,d;
cin>>n>>d;
vector<int> v;
for(int i=0;i<n;i++){
int a;
cin>>a;
v.push_back(a);
}
set<int> s;
for(auto x:v){
if(s.lower_bound(x)!=s.end()){
s.erase(s.lower_bound(x));
}
s.insert(x);
}
cout<<s.size()<<"\n";
return 0;
}
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