using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Remoting.Contexts;

namespace Contest
{
    class Program
    {
        private int N;
        private List<int>[] E;
        private bool[] Memo;
        public void Solve()
        {
            var sc = new Scanner();
            N = sc.NextInt();
            E = new List<int>[N];
            for (int i = 0; i < N; i++)
            {
                E[i] = new List<int>();
            }
            for (int i = 0; i < N - 1; i++)
            {
                int a = sc.NextInt() - 1;
                int b = sc.NextInt() - 1;
                E[a].Add(b);
                E[b].Add(a);
            }
            Memo = new bool[N];
            int s;
            Dist(0, out s);
            int g;
            Memo = new bool[N];
            int dist = Dist(s, out g);
            //Console.WriteLine($"{dist} {s} {g}");
            Console.WriteLine(dist%3 ==1?"Second":"First");
        }

        private int Dist(int n, out int o)
        {
            int ret = 0;
            o = n;
            Memo[n] = true;
            foreach (var i in E[n])
            {
                if (!Memo[i])
                {
                    int oo;
                    int d = Dist(i, out oo) + 1;
                    if (ret < d)
                    {
                        ret = d;
                        o = oo;
                    }
                }
            }

            Memo[n] = false;
            return ret;
        }

        static void Main() => new Program().Solve();
    }
}

class Scanner
{
    public Scanner()
    {
        _stream = new StreamReader(Console.OpenStandardInput());
        _pos = 0;
        _line = new string[0];
        _separator = ' ';
    }
    private char _separator;
    private StreamReader _stream;
    private int _pos;
    private string[] _line;
    #region get a element
    public string Next()
    {
        if (_pos >= _line.Length)
        {
            _line = _stream.ReadLine().Split(_separator);
            _pos = 0;
        }
        return _line[_pos++];
    }
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    #endregion
    #region convert array
    private int[] ToIntArray(string[] array)
    {
        var result = new int[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = int.Parse(array[i]);
        }

        return result;
    }
    private long[] ToLongArray(string[] array)
    {
        var result = new long[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = long.Parse(array[i]);
        }

        return result;
    }
    private double[] ToDoubleArray(string[] array)
    {
        var result = new double[array.Length];
        for (int i = 0; i < array.Length; i++)
        {
            result[i] = double.Parse(array[i]);
        }

        return result;
    }
    #endregion
    #region get array
    public string[] Array()
    {
        if (_pos >= _line.Length)
            _line = _stream.ReadLine().Split(_separator);
        _pos = _line.Length;
        return _line;
    }
    public int[] IntArray()
    {
        return ToIntArray(Array());
    }
    public long[] LongArray()
    {
        return ToLongArray(Array());
    }
    public double[] DoubleArray()
    {
        return ToDoubleArray(Array());
    }
    #endregion
}

Measured memory_bytes: 61504