using System;
using System.Collections.Generic;
using System.Linq;

namespace Yukicoder
{
	class Program
	{
		public static void Main(string[] args)
		{
			var m = new Dictionary<int,int>();
			var n = int.Parse(Console.ReadLine());
			m[0]=1;
			Enumerable.Range(1,n).Select(_ => Console.ReadLine().Split(' ').Select(x=>int.Parse(x)).ToList()).ToList().OrderBy(x => x[0]+x[1]).ToList().ForEach(
			x =>{
				for(int i=x[1]-1;i>=0;i--){
					if(m.ContainsKey(i))m[i+x[0]]=1;
				}
			});
			Console.WriteLine("{0}",m.Keys.Max());
		}
	}
}