using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _545
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var inputs = Enumerable.Range(0, n).Select(_ =>
            {
                var line = Console.ReadLine().Split().Select(long.Parse).ToList();
                return Tuple.Create(line[0], line[1]);
            }).ToList();

            var diffs = new HashSet<long>() { 0 };
            foreach (var input in inputs)
            {
                var nexts = new HashSet<long>();
                foreach (var diff in diffs)
                {
                    nexts.Add(diff + input.Item1);
                    nexts.Add(diff - input.Item2);
                }
                diffs = nexts;
            }

            var answer = Math.Abs(diffs.Min(diff => Math.Abs(diff)));
            Console.WriteLine(answer);
        }
    }
}