// Muallif: Mansuraliyev Husanboy Murotali o'g'li >> NamPS
#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define ios ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define all(a) a.begin(), a.end()
#define F first
#define S second
#define fp(a,i,c) for(int (a) = (i); (a) < (c); (a)++)
#define fm(a,i,c) for(int (a) = (i); (a) >= (c); (a)--)
#define vii vector<int>
#define vll vector<ll>
// 0-9 >> 48-57; A-Z>>65-90 and a-z>>97-122 respectively;
void solve(){
int n; ll x; cin>>n>>x;
ll a[n];
for(int i=0;i<n;i++) cin>>a[i];
set<int> st;
set<int>::iterator it;
st.clear();
for(int i=0; i<n; i++) {
it = st.lower_bound(a[i]);
if (it != st.end()) st.erase(it);
st.insert(a[i]);
}
cout<<st.size()<<endl;
// for(auto u:st) cout<<u<<" ";
}
int main(){
ios;
// int t; cin>>t; while(t--)
solve();
}
