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# include <cstdio>
# define N 100010
using namespace std;
int poz,p,i,Max,n;
int st[N],sol[N],a[N];
int bs(int val)
{
int m;
int l=1,r=st[0];
while(l<=r)
{
m=(l+r)>>1;
if(st[m]==val) return m;
else if(st[m]<val) l=m+1;
else r=m-1;
}
return l;
}
int main()
{
freopen("scmax.in", "r", stdin);
freopen("scmax.out", "w", stdout);
scanf("%d\n", &n);
for(int i=1; i<=n; ++i)
{
scanf("%d ", &a[i]);
poz=bs(a[i]);
st[poz]=a[i];
sol[i]=poz;
if(poz>st[0]) st[0]++;
if(poz>Max) Max=poz,p=i;
}
printf("%d\n", Max);
}