Vanya wants to minimize a tree. He can perform the following operation multiple times: choose a vertex v, and two disjoint (except for v) paths of equal length a0 = v, a1, ..., ak, and b0 = v, b1, ..., bk. Additionally, vertices a1, ..., ak, b1, ..., bk must not have any neighbours in the tree other than adjacent vertices of corresponding paths. After that, one of the paths may be merged into the other, that is, the vertices b1, ..., bk can be effectively erased:

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Help Vanya determine if it possible to make the tree into a path via a sequence of described operations, and if the answer is positive, also determine the shortest length of such path.

Input

The first line of input contains the number of vertices n (2 ≤ n ≤ 2·105).

Next n - 1 lines describe edges of the tree. Each of these lines contains two space-separated integers u and v (1 ≤ u, v ≤ n, u ≠ v) — indices of endpoints of the corresponding edge. It is guaranteed that the given graph is a tree.

Output

If it is impossible to obtain a path, print -1. Otherwise, print the minimum number of edges in a possible path.

Examples

Input

6
1 2
2 3
2 4
4 5
1 6


Output

3


Input

7
1 2
1 3
3 4
1 5
5 6
6 7


Output

-1

Note

In the first sample case, a path of three edges is obtained after merging paths 2 - 1 - 6 and 2 - 4 - 5.

It is impossible to perform any operation in the second sample case. For example, it is impossible to merge paths 1 - 3 - 4 and 1 - 5 - 6, since vertex 6 additionally has a neighbour 7 that is not present in the corresponding path.
class Node(object):

	__slots__ = ('index', 'neighbors', 'parent', 'depth', 'node_depth_map', 'depth_nodes_map', 'unbalance_nodes')

	def __init__(self, index):
		self.index = index
		self.neighbors = []
		self.parent = None
		self.depth = 0
		self.node_depth_map = {}
		self.depth_nodes_map = {}
		self.unbalance_nodes = []

	def __repr__(self):
		return '*%d' % self.index


n = input()
nodes = [Node(i) for i in xrange(n + 1)]
for _ in xrange(n - 1):
	u, v = map(int, raw_input().split())
	nodes[u].neighbors.append(nodes[v])
	nodes[v].neighbors.append(nodes[u])


stack = []
stack_tmp = [nodes[1]]
while stack_tmp:
	node = stack_tmp.pop()
	parent_node = node.parent
	if len(node.neighbors) > 1 or not parent_node:
		for neighbor_node in node.neighbors:
			if neighbor_node != parent_node:
				stack_tmp.append(neighbor_node)
				neighbor_node.parent = node
				stack.append(neighbor_node)


for node in reversed(stack):
	parent_node = node.parent
	parent_node.node_depth_map[node] = depth = node.depth + 1

	if depth in parent_node.depth_nodes_map:
		depth_nodes = parent_node.depth_nodes_map[depth]
	else:
		depth_nodes = parent_node.depth_nodes_map[depth] = []
	depth_nodes.append(node)

	if depth > parent_node.depth:
		parent_node.depth = depth

	balance = not node.unbalance_nodes and len(node.depth_nodes_map) <= 1
	if not balance:
		parent_node.unbalance_nodes.append(node)
del stack


min_length = -1
stack_tmp = [nodes[1]]
while stack_tmp:
	node = stack_tmp.pop()

	parent_node = node.parent
	depth_nodes_map = node.depth_nodes_map
	unbalance_nodes = node.unbalance_nodes
	node_depth_map = node.node_depth_map

	if len(unbalance_nodes) >= 2:
		break
	if len(depth_nodes_map) >= 3:
		break
	if not unbalance_nodes:
		length = sum(depth_nodes_map.keys())
		while length & 1 == 0:
			length >>= 1
		if min_length == -1:
			min_length = length
		elif length < min_length:
			min_length = length
		break
	if unbalance_nodes:
		neighbor_node = unbalance_nodes[0]
		if neighbor_node != parent_node:
			depth = 0
			for child_node, child_depth in node_depth_map.iteritems():
				if child_node != neighbor_node:
					if child_depth > depth:
						depth = child_depth
			depth += 1
			neighbor_node.node_depth_map[node] = depth

			if depth in neighbor_node.depth_nodes_map:
				depth_nodes = neighbor_node.depth_nodes_map[depth]
			else:
				depth_nodes = neighbor_node.depth_nodes_map[depth] = []
			depth_nodes.append(node)

			unbalance_nodes_count = len(unbalance_nodes)
			if neighbor_node in unbalance_nodes:
				unbalance_nodes_count -= 1
			balance = True
			if unbalance_nodes_count > 0:
				balance = False
			else:
				depth_count = len(depth_nodes_map)
				if len(depth_nodes_map[node_depth_map[neighbor_node]]) == 1:
					depth_count -= 1
				if depth_count > 1:
					balance = False
			if not balance:
				neighbor_node.unbalance_nodes.append(node)

			stack_tmp.append(neighbor_node)

print min_length