static void DFS(Node node, long currentSum)
{
currentSum += node.Value;
usedNodes.Add(node);
for (int i = 0; i < node.NumberOfChildren; i++)
{
if (usedNodes.Contains(node.GetChild(i)))
{
continue;
}
DFS(node.GetChild(i), currentSum);
}
if (node.NumberOfChildren == 1 && currentSum >= maxSum)
{
maxSum = currentSum;
}
}
public void AddChild(Node child)
{
child.hasParent = true;
children.Add(child);
}
public static void Main()
{
int n = int.Parse(Console.ReadLine());
Dictionary<int, Node> nodes = new Dictionary<int, Node>();
int maxNode = 0;
for (int i = 0; i < n - 1; i++)
{
string connection = Console.ReadLine();
string[] separatedConnection = connection.Split(new char[] {'(', '<', '-', ')'}, StringSplitOptions.RemoveEmptyEntries);
int parent = int.Parse(separatedConnection[0]);
int child = int.Parse(separatedConnection[1]);
Node parentNode;
Node childNode;
if (nodes.ContainsKey(parent))
{
parentNode = nodes[parent];
}
else
{
parentNode = new Node(parent);
nodes.Add(parent, parentNode);
}
if (nodes.ContainsKey(child))
{
childNode = nodes[child];
}
else
{
childNode = new Node(child);
nodes.Add(child, childNode);
}
parentNode.AddChild(childNode);
childNode.AddChild(parentNode);
if (parent > maxNode)
{
maxNode = parent;
}
if (child > maxNode)
{
maxNode = child;
}
}
foreach (var node in nodes)
{
if (node.Value.NumberOfChildren == 1)
{
usedNodes.Clear();
DFS(node.Value, 0);
}
}
Console.WriteLine(maxSum);
}