N=int(raw_input())
A=map(int,raw_input().split())
dpL=[[1 for j in range(N)] for k in range(N)]
dpR=[[1 for j in range(N)] for k in range(N)]
ans=1
for d in range(1,N):
    for l in range(N-d):
        # update l,l+d
        if A[l]<A[l+d]:
            dpL[l][l+d]=max(dpL[l][l+d-1],dpR[l+1][l+d]+1)
            dpR[l][l+d]=dpR[l+1][l+d]
        if A[l]>A[l+d]:
            dpL[l][l+d]=dpL[l][l+d-1]
            dpR[l][l+d]=max(dpR[l+1][l+d],dpL[l][l+d-1]+1)
        ans=max(ans,dpL[l][l+d])
        ans=max(ans,dpR[l][l+d])

print ans