using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using static System.Console;
using static System.Math;

namespace Atcoder
{
    class Program
    {
        static StreamWriter sw = new StreamWriter(OpenStandardOutput()) { AutoFlush = false };
        static void Main(string[] args)
        {
            try
            {
                SetOut(sw);
                Solve.Answer();
                Out.Flush();
            }
            catch (Exception ex)
            {
                WriteLine(ex.ToString());
            }
        }
    }

    public class Solve
    {
        public static void Answer()
        {
            var n = IO.RInt;
            var a = new int[n];
            var b = new int[n];
            for (int i = 0; i < n; i++)
            {
                var ab = IO.RSInt;
                a[i] = ab[0];
                b[i] = ab[1];
            }

            Array.Sort(a);
            Array.Sort(b);
            int Minx;
            int Maxx;
            if (n % 2 == 1)
            {
                Minx = a[a.Length / 2];
                Maxx = b[b.Length / 2];
                WriteLine(Maxx - Minx + 1);
            }
            else
            {
                Minx = (a[a.Length / 2] + a[a.Length / 2 - 1]) / 2;
                double mi = (double)(a[a.Length / 2] + a[a.Length / 2 - 1]) / 2;
                bool fmi = Minx == mi;

                Maxx = (b[b.Length / 2] + b[b.Length / 2 - 1]) / 2;
                double ma = (double)(b[b.Length / 2] + b[b.Length / 2 - 1]) / 2;
                bool fma = Maxx == ma;
                //if ((fmi && !fma) || (!fmi && fma))
                //{
                //    WriteLine(2 * (Maxx - Minx + 1));
                //}
                //else
                //{
                //    WriteLine(2 * (Maxx - Minx) + 1);
                //}
                WriteLine(2 * (ma - mi) + 1);
            }
        }
    }

    public class IO
    {
        #region Input
        public static int RInt => int.Parse(ReadLine());
        public static long RLong => long.Parse(ReadLine());
        public static double RDouble => double.Parse(ReadLine());

        public static string[] RSString => ReadLine().Split();
        public static int[] RSInt => ReadLine().Split().Select(s => int.Parse(s)).ToArray();
        public static long[] RSLong => ReadLine().Split().Select(s => long.Parse(s)).ToArray();
        public static double[] RSDouble => ReadLine().Split().Select(s => double.Parse(s)).ToArray();
        #endregion

        #region Output
        public static void OutJoinSpace<T>(IEnumerable<T> list) => WriteLine(string.Join(" ", list));
        public static void WriteLineYes_or_No(bool flag) => WriteLine(flag ? "Yes" : "No");
        public static void WriteLineYES_or_NO(bool flag) => WriteLine(flag ? "YES" : "NO");
        #endregion
    }

    public class Mod
    {
        #region
        private readonly static long M = 1000000007;

        public static long Add(long a, long b) => (a * b) % M;
        public static long Sub(long a, long b) => (a - b) % M >= 0 ? (a - b) % M : (a - b) % M + M;
        public static long Multi(long a, long b) => (a * b) % M;
        #endregion
    }
}

Measured memory_bytes: 43008