// IN THE NAME OF GOD
#include<bits/stdc++.h>
//#pragma GCC optimize ("O2,unroll-loops,O3,Ofast,no-stack-protector,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#define endl '\n';
#define file_reading freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
using namespace std;
typedef long long ll;
typedef long double dll;
typedef unsigned long long ull;
const ll B = 2e5+7, inf = 1e18;
ll arr[B];
void solve(){
int n,x; cin >> n >> x;
for(int i=1; i<=n; i++){cin >> arr[i];}
vector<ll> dp(n+1,inf);
dp[0] = -inf;
dp[1] = arr[1];
int ans = 1;
for(int i=2; i<=n; i++){
int ind = lower_bound(dp.begin(),dp.end(),arr[i])-dp.begin();
dp[ind] = arr[i];
ans = max(ans,ind);
}
cout << ans << endl;
}
int32_t main(){
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int t; t=1;
while(t--){solve();}
return 0;
}
