#include<iostream>
using namespace std;
int main()
{
int n;
cin>>n;
int arr[n];
int dp[n];
for(int i=0; i<n; ++i)
{
cin>>arr[i];
}
for(int i=0; i<n; i++)
{
dp[i] = 1;
}
for(int i = 1; i<n; ++i)
{
for(int j = 0; j < i; ++j)
{
if(dp[i] == dp[j] && arr[i] > arr[j])
{
dp[i] = dp[j] + 1;
}
}
}
int max = 0;
for(int i=0; i<n; ++i)
{
if(dp[i] > max)
{
max = dp[i];
}
}
cout<<max;
return 0;
}
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