from bisect import bisect_left

N = int(input())
A = list(map(int, input().split()))

LIS = []

for a in A :
    if not len(LIS) or a > LIS[-1]:
        LIS.append(a)
    else:
        idx = bisect_left(LIS, a)
        LIS[idx] = a

print(len(LIS))