import sys
input=lambda: sys.stdin.readline().rstrip()
import bisect
n=int(input())
A=[int(i) for i in input().split()]
LI,LD=[0]*n,[0]*n
I,D=[A[0]],[-A[0]]
il,dl=1,1
for i in range(1,n):
	a=A[i]
	if I[-1]<a:
		LI[i]=il
		il+=1
		I.append(a)
	else:
		ind_i=bisect.bisect_left(I,a)
		LI[i]=ind_i
		I[ind_i]=a
	if D[-1]<-a:
		LD[i]=dl
		dl+=1
		D.append(-a)
	else:
		ind_d=bisect.bisect_left(D,-a)
		LD[i]=ind_d
		D[ind_d]=-a

RI,RD=[0]*n,[0]*n
I,D=[A[-1]],[-A[-1]]
ir,dr=1,1
for i in range(1,n):
	a=A[n-1-i]
	if I[-1]<a:
		RI[i]=ir
		ir+=1
		I.append(a)
	else:
		ind_i=bisect.bisect_left(I,a)
		RI[i]=ind_i
		I[ind_i]=a
	if D[-1]<-a:
		RD[i]=dr
		dr+=1
		D.append(-a)
	else:
		ind_d=bisect.bisect_left(D,-a)
		RD[i]=ind_d
		D[ind_d]=-a

ans=0
for i in range(n):
	ans=max(ans,min(LI[i],RI[n-1-i]),min(LD[i],RD[n-1-i]))
print(ans)