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

processed = []
if a:
    processed.append(a[0])
    for num in a[1:]:
        if num != processed[-1]:
            processed.append(num)

if len(processed) < 3:
    print(0)
else:
    up = 1
    down = 1
    for i in range(1, len(processed)):
        if processed[i] > processed[i-1]:
            up = down + 1
        elif processed[i] < processed[i-1]:
            down = up + 1
    max_len = max(up, down)
    print(max_len if max_len >= 3 else 0)