using System;
using System.Linq;
using System.Collections.Generic;
using Debug = System.Diagnostics.Trace;
using SB = System.Text.StringBuilder;
using Number = System.Int64;
namespace Program
{
    public class Solver
    {
        public void Solve()
        {
            var n = ri;
            var m = ri;
            var w = ri;
            var a = new long[n + m];
            for (int i = 0; i < n + m; i++)
            {
                var x = rl;
                var y = rl;
                a[i] = (y * 100000 + x) * 2;
                if (i >= n) a[i]++;
            }
            Array.Sort(a);
            //foreach (var x in a) Debug.WriteLine($"{(x / 2) / 100000} {(x / 2) % 100000} {x % 2}");
            var l = -1L; var r = (long)1e9;
            while (r - l > 1)
            {
                var X = (l + r) / 2;
                //X = 67;
                var dp = Enumerate(2, t => Enumerate(w + 1, x => -1));
                var ok = false;
                for (int i = 0; i < n + m && !ok; i++)
                {
                    var v = (int)((a[i] / 2) / 100000);
                    var u = (int)((a[i] / 2) % 100000);
                    var k = (int)(a[i] % 2);
                    //Debug.WriteLine($"{v} {u} {k}");
                    for (int j = w - u; j >= 0; j--)
                        if (dp[k][j] != -1) dp[k][j + u] = Math.Max(dp[k][j + u], dp[k][j]);
                    if (u <= w)
                        dp[k][u] = Math.Max(dp[k][u], v);
                    var last = new int[2];
                    for (int j = 0; j <= w && !ok; j++)
                    {
                        for (int t = 0; t < 2; t++)
                            if (dp[t][j] != -1 && v - dp[t][j] <= X)
                                last[t] = j;
                        if (last[0] != 0 && last[1] != 0 && Math.Abs(last[0] - last[1]) <= X)
                        {
                            ok = true;
                        }
                    }
                }
                if (ok) r = X;
                else l = X;
            }
            Console.WriteLine(r);
        }
        const long INF = 1L << 60;
        //int[] dx = { -1, 0, 1, 0 };
        //int[] dy = { 0, 1, 0, -1 };
        //*
        int ri { get { return sc.Integer(); } }
        long rl { get { return sc.Long(); } }
        double rd { get { return sc.Double(); } }
        string rs { get { return sc.Scan(); } }
        //*/

        public IO.StreamScanner sc = new IO.StreamScanner(Console.OpenStandardInput());
        static T[] Enumerate<T>(int n, Func<int, T> f) { var a = new T[n]; for (int i = 0; i < n; ++i) a[i] = f(i); return a; }
        static public void Swap<T>(ref T a, ref T b) { var tmp = a; a = b; b = tmp; }
    }
}

#region main
static class Ex
{
    static public string AsString(this IEnumerable<char> ie) { return new string(ie.ToArray()); }
    static public string AsJoinedString<T>(this IEnumerable<T> ie, string st = " ")
    {
        return string.Join(st, ie.Select(x => x.ToString()).ToArray());
        //return string.Join(st, ie);
    }
    static public void Main()
    {
        Console.SetOut(new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
        var solver = new Program.Solver();
        solver.Solve();
        Console.Out.Flush();
    }
}
#endregion
#region Ex
namespace Program.IO
{
    using System.IO;
    using System.Text;
    using System.Globalization;
    public class Printer: StreamWriter
    {
        public override IFormatProvider FormatProvider { get { return CultureInfo.InvariantCulture; } }
        public Printer(Stream stream) : base(stream, new UTF8Encoding(false, true)) { }
    }
    public class StreamScanner
    {
        public StreamScanner(Stream stream) { str = stream; }
        public readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;
        public bool IsEndOfStream { get { return isEof; } }
        private byte read()
        {
            if (isEof) return 0;
            if (ptr >= len) { ptr = 0; if ((len = str.Read(buf, 0, 1024)) <= 0) { isEof = true; return 0; } }
            return buf[ptr++];
        }
        public char Char() { byte b = 0; do b = read(); while ((b < 33 || 126 < b) && !isEof); return (char)b; }

        public string Scan()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        public string ScanLine()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b != '\n' && b != 0; b = (char)read())
                if (b != '\r') sb.Append(b);
            return sb.ToString();
        }
        public long Long() { return isEof ? long.MinValue : long.Parse(Scan()); }
        public int Integer() { return isEof ? int.MinValue : int.Parse(Scan()); }
        public double Double() { return isEof ? double.NaN : double.Parse(Scan(), CultureInfo.InvariantCulture); }
    }
}
#endregion


Measured memory_bytes: 10344