#include<bits/stdc++.h>
using namespace std;
int n,a[10005],dp[10005],p;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    dp[1]=1;
    for(int i=2;i<=n;i++)
    {
        dp[i]=1;
        for(int j=1;j<=i;j++)
        {
            if(a[i]>a[j]) dp[i]=max(dp[i],dp[j]+1);
        }
    }
    for(int i=1;i<=n;i++)
    {
        p=max(p,dp[i]);
    }
    cout<<p;
} 
/**************************************************************
	Problem: 1794
	User: hongyipin
	Language: C++
	Result: Accepted
	Time:296 ms
	Memory:2152 kb
****************************************************************/