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

# Preprocess to remove consecutive duplicates
B = []
prev = None
for num in A:
    if prev is None or num != prev:
        B.append(num)
        prev = num

m = len(B)
if m < 3:
    print(0)
else:
    up = 1
    down = 1
    for i in range(1, m):
        current = B[i]
        prev_val = B[i-1]
        if current > prev_val:
            new_up = down + 1
            up = new_up
        elif current < prev_val:
            new_down = up + 1
            down = new_down
    max_len = max(up, down)
    print(max_len if max_len >= 3 else 0)