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

# Compress consecutive duplicates
compressed = []
prev = None
for num in A:
    if num != prev:
        compressed.append(num)
        prev = num
m = len(compressed)

if m < 3:
    print(0)
else:
    dp_inc = [1] * m
    dp_dec = [1] * m

    for i in range(1, m):
        if compressed[i] > compressed[i-1]:
            dp_inc[i] = dp_dec[i-1] + 1
            dp_dec[i] = dp_dec[i-1]
        elif compressed[i] < compressed[i-1]:
            dp_dec[i] = dp_inc[i-1] + 1
            dp_inc[i] = dp_inc[i-1]

    max_len = max(max(dp_inc), max(dp_dec))
    print(max_len if max_len >= 3 else 0)