#include <iostream>
#include <stack>
#include <fstream>
#include <vector>
#include <algorithm>
#include <ctime>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int dp[1001], v[1001], i, j, Max=-1, n;
int main()
{
    in>>n;
    for(i=1;i<=n;i++)
    {
        dp[i]=1;
        in>>v[i];
    }
    for(i=2;i<=n;i++)
        for(j=1;j<=i;j++)
            if(v[j]<v[i]) dp[i]= max(dp[j]+1, dp[i]);
    for(i=1;i<=n;i++)
        Max=max(dp[i],Max);
    out<<Max;
    return 0;
}