using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static void Main()
    {
        new Magatro().Solve();
    }
}

class Magatro
{
    private int N;
    private int[] A, B;

    private List<long> a = new List<long>(), b = new List<long>();

    private long ans = long.MaxValue;
    private void Scan()
    {
        N = int.Parse(Console.ReadLine());
        A = new int[N];
        B = new int[N];
        for (int i = 0; i < N; i++)
        {
            var line = Console.ReadLine().Split(' ');
            A[i] = int.Parse(line[0]);
            B[i] = int.Parse(line[1]);
        }
    }

    private void DFS(long aa, long bb, int left, int right, List<long> t)
    {
        if (left == right)
        {
            t.Add(aa - bb);
            return;
        }
        DFS(aa + A[left], bb, left + 1, right, t);
        DFS(aa, bb + B[left], left + 1, right, t);
    }

    public void Solve()
    {
        Scan();
        DFS(0, 0, 0, N / 2, a);
        DFS(0, 0, N / 2, N, b);
        b.Sort();
        long ans = long.MaxValue;
        foreach (long l in a)
        {
            int left = 0, right = b.Count;
            while (right - left > 1)
            {
                int mid = (left + right) / 2;
                if (l + b[mid] > 0)
                {
                    right = mid;
                }
                else
                {
                    left = mid;
                }
            }
            ans = Math.Min(l + b[right], ans);

            left = -1;
            right = b.Count-1;
            while (right - left > 1)
            {
                int mid = (left + right) / 2;
                if (l + b[mid] >= 0)
                {
                    right = mid;
                }
                else
                {
                    left = mid;
                }
            }
            ans = Math.Min(l + b[right], ans);
        }
        Console.WriteLine(ans);
    }
}