class Node:
def __init__(self, info):
self.info = info
self.left = None
self.right = None
self.level = None
def __str__(self):
return str(self.info)
class BinarySearchTree:
def __init__(self):
self.root = None
def create(self, val):
if self.root == None:
self.root = Node(val)
else:
current = self.root
while True:
if val < current.info:
if current.left:
current = current.left
else:
current.left = Node(val)
break
elif val > current.info:
if current.right:
current = current.right
else:
current.right = Node(val)
break
else:
break
# Enter your code here. Read input from STDIN. Print output to STDOUT
'''
class Node:
def __init__(self,info):
self.info = info
self.left = None
self.right = None
// this is a node of the tree , which contains info as data, left , right
'''
def height(node):
if node != None:
if (node.left or node.right):
if node.right != None:
rightHeight = 1 + height(node.right)
else:
rightHeight = 0
if node.left != None:
leftHeight = 1 + height(node.left)
else:
leftHeight = 0
return max(rightHeight, leftHeight)
else:
return 0
tree = BinarySearchTree()
t = int(input())
arr = list(map(int, input().split()))
for i in range(t):
tree.create(arr[i])
print(height(tree.root))
""" inputs:
7
3 5 2 1 4 6 7
1
15
5
3 1 7 5 4
"""
