def count(n): 
    if (n & 1): 
        return 0
    val = n // 2
    dy_lst = [1 for i in range(val + 1)] 
    for i in range(2, val + 1): 
        dy_lst[i] = 0
        for j in range(i): 
            dy_lst[i] += (dy_lst[j] * dy_lst[i - j - 1]) 
    return dy_lst[val]