class Node:
    def __init__(self, val=0, left=None, right=None):
        self.val = val
        self.left = left
        self.right = right

def find(root, x):
    while root:
        if root.val == x:
            return True
        if x < root.val:
            root = root.left
        else:
            root = root.right
    return False