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

def zunda(L):
    ret = 1
    prev = L[0]
    skip = True
    for i in range(1,len(L)):
        if not skip:
            ret += 1
            prev = L[i]
            skip = True
        else:
            if prev == L[i]:
                ret += 1
            else:
                skip = False
    return ret
    
print(max(zunda(A), zunda(A[::-1])))