using System;
using System.IO;
using System.Collections.Generic;

namespace No763
{
    public class Program
    {
        class Node
        {
            public List<int> Children = new List<int>();
            public int MaxDel = 0;
            public int MaxLev = 1;
        }

        void Solve(StreamScanner ss, StreamWriter sw)
        {
            //---------------------------------
            var N = ss.Next(int.Parse);
            var nodes = new Node[N + 1];

            for (var i = 1; i <= N; i++)
            {
                nodes[i] = new Node();
            }

            for (var i = 0; i < N - 1; i++)
            {
                var u = ss.Next(int.Parse);
                var v = ss.Next(int.Parse);
                nodes[u].Children.Add(v);
                nodes[v].Children.Add(u);
            }

            void DFS(int i)
            {
                var p = nodes[i];
                foreach (var ci in p.Children)
                {
                    var c = nodes[ci];
                    c.Children.Remove(i);
                    DFS(ci);
                    p.MaxDel += Math.Max(c.MaxDel, c.MaxLev);
                    p.MaxLev += Math.Max(c.MaxDel, c.MaxLev - 1);
                }
            }

            DFS(1);
            var root = nodes[1];
            sw.WriteLine(Math.Max(root.MaxDel, root.MaxLev));
            //---------------------------------
        }

        static void Main()
        {
            var ss = new StreamScanner(new StreamReader(Console.OpenStandardInput()));
            var sw = new StreamWriter(Console.OpenStandardOutput()) {AutoFlush = false};
            new Program().Solve(ss, sw);
            sw.Flush();
        }

        static readonly Func<string, string> String = s => s;
    }

    public class StreamScanner
    {
        static readonly char[] Sep = {' '};
        readonly Queue<string> buffer = new Queue<string>();
        readonly TextReader textReader;

        public StreamScanner(TextReader textReader)
        {
            this.textReader = textReader;
        }

        public T Next<T>(Func<string, T> parser)
        {
            if (buffer.Count != 0) return parser(buffer.Dequeue());
            var nextStrings = textReader.ReadLine().Split(Sep, StringSplitOptions.RemoveEmptyEntries);
            foreach (var nextString in nextStrings) buffer.Enqueue(nextString);
            return Next(parser);
        }

        public T[] Next<T>(Func<string, T> parser, int x)
        {
            var ret = new T[x];
            for (var i = 0; i < x; ++i) ret[i] = Next(parser);
            return ret;
        }

        public T[][] Next<T>(Func<string, T> parser, int x, int y)
        {
            var ret = new T[y][];
            for (var i = 0; i < y; ++i) ret[i] = Next(parser, x);
            return ret;
        }
    }
}