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

if n < 3:
    print(0)
else:
    found = False
    for k in range(6, 2, -1):
        if k > n:
            continue
        for i in range(n - k + 1):
            valid = True
            for j in range(i, i + k - 2):
                x = a[j]
                y = a[j+1]
                z = a[j+2]
                if x == y or y == z or x == z:
                    valid = False
                    break
                if not ((y > x and y > z) or (y < x and y < z)):
                    valid = False
                    break
            if valid:
                print(k)
                found = True
                break
        if found:
            break
    if not found:
        print(0)