#include <stdio.h>
int main()
{
    FILE *fin=fopen("scmax.in", "r");
    FILE *fout=fopen("scmax.out", "w");

    int b[1005]={0}, a[1005]={0}, n, maxi, rez=-1;
    fscanf(fin, "%d", &n);
    for(int i=1; i<=n; ++i)
        fscanf(fin, "%d", &a[i]);

    for(int i=1; i<=n; ++i)
    {
        maxi=0;
        for(int j=1; j<i; ++j)
            if(a[j]<a[i] && maxi<b[j])
                maxi=b[j];
        b[i]=1+maxi;
        if(b[i]>rez)
            rez=b[i];
    }
    fprintf(fout, "%d", rez);

    fclose(fin);
    fclose(fout);
    return 0;
}