#include<iostream>
#include<cstdio>
#include<cctype>
#include<cstring>
#define gys mylove
using namespace std;
int n,a[1002],dp[1002],ans=0;
inline void in(int &x)
{
    x=0;int f=1;char t=getchar();
    while(!isdigit(t)){if(t=='-')f=-1;t=getchar();}
    while(isdigit(t)){x=x*10+t-48;t=getchar();}
    x*=f;
}
inline void work(){
	for(int i=0;i<=1001;i++) dp[i]=1;
	in(n);for(int i=0;i<n;i++) in(a[i]);
	for(int i=1;i<n;i++)
	 for(int j=0;j<i;j++){
	 	if(a[j]<a[i]) dp[i]=max(dp[i],dp[j]+1);
	 	ans=max(dp[i],ans);
	 }
	printf("%d",ans);
}
int Main(){
	freopen("lis1.in","r",stdin);
	freopen("lis1.out","w",stdout);
	work();
	return 0;
}
int main(){;}
int gys=Main();