using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
//using System.Text;
//using System.Text.RegularExpressions;
//using System.Globalization;
//using System.Diagnostics;
using static System.Console;
//using System.Numerics;
//using static System.Math;
//using pair = Pair<int, int>;

class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 }; //→↓←↑
    readonly int mod = 1000000007;
    void chmax<T>(ref T a, T b) where T : IComparable<T> { a = a.CompareTo(b) < 0 ? b : a; }
    void chmin<T>(ref T a, T b) where T : IComparable<T> { a = a.CompareTo(b) < 0 ? a : b; }

    void solve()
    {
        int N = cin.nextint;
        int M = 100001;
        var A = new int[2, M];// Aがi秒かかるときにBのかかる時間の最小値
        for (int i = 0; i < M; i++)
        {
            A[0, i] = int.MaxValue / 3;
        }
        A[0, 0] = 0;
        var B = new bool[A.Length];
        for (int i = 0; i < N; i++)
        {
            int a = cin.nextint;
            int b = cin.nextint;
            int p = (i + 1) % 2;
            int q = i % 2;
            for (int j = 0; j < M; j++)
            {
                A[p, j] = int.MaxValue / 3;
            }
            for (int j = 0; j < M; j++)
            {
                if(j + a < M)chmin(ref A[p, j + a], A[q, j]);
                chmin(ref A[p, j], A[q, j] + b);
            }
            //for (int j = 0; j <= 105; j++)
            //{
            //    WriteLine(j + " " + A[p, j]);
            //}

            //WriteLine();
        }
        int ans = int.MaxValue;
        for (int i = 0; i < M; i++)
        {
            chmin(ref ans, Math.Max(i, A[N % 2, i]));
        }
        WriteLine(ans);

    }

}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] scan { get { return ReadLine().Split(); } }
    public int[] scanint { get { return Array.ConvertAll(scan, int.Parse); } }
    public long[] scanlong { get { return Array.ConvertAll(scan, long.Parse); } }
    public double[] scandouble { get { return Array.ConvertAll(scan, double.Parse); } }
    public string next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return next;
        }
    }
    public int nextint { get { return int.Parse(next); } }
    public long nextlong { get { return long.Parse(next); } }
    public double nextdouble { get { return double.Parse(next); } }
}