#include <iostream>
#include <stdio.h>

using namespace std;


FILE *f=fopen("scmax.in","r");
FILE *g=fopen("scmax.out","w");

 int a[100000],v[100000],mx,mx1,i,j,ok,n;


int main()
{
      fscanf(f,"%d",&n);
      for (i=1;i<=n;i++)
           fscanf(f,"%d",&v[i]);
      a[n]=1;
      for (i=n-1;i>=1;i--){
          ok=0;
          mx1=0;
           for (j=i+1;j<=n;j++)
               if (v[j]>v[i] && a[j]>mx1)
                 {
                  mx1=a[j];
                   ok=1;
                 }
           a[i]=mx1+1;
      }
      for (i=1;i<=n;i++)
	       if (a[i]>mx) mx=a[i];
      fprintf(g,"%d",mx);

     fclose(g);
	return 0;
}