using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using static System.Console;
using static System.Math;

namespace Atcoder
{
    class Program
    {
        static StreamWriter sw = new StreamWriter(OpenStandardOutput()) { AutoFlush = false };
        static void Main(string[] args)
        {
            try
            {
                SetOut(sw);
                Solve.Answer();
                Out.Flush();
            }
            catch (Exception ex)
            {
                WriteLine(ex.ToString());
            }
        }
    }

    public class Solve
    {
        public static void Answer()
        {
            var nmk = IO.RSLong;
            var a = IO.RSLong;
            var b = IO.RSLong;

            var cum_a = new long[a.Length + 1];
            for (int i = 0; i < a.Length; i++)
            {
                cum_a[i + 1] = cum_a[i] + a[i];
            }
            var cum_b = new long[b.Length + 1];
            for (int i = 0; i < b.Length; i++)
            {
                cum_b[i + 1] = cum_b[i] + b[i];
            }


            long ans = 0;
            for (int i = 0; i < cum_a.Length; i++)
            {
                long rem = nmk[2];
                rem -= cum_a[i];
                if (rem < 0) continue;
                long cnt = i;

                // にぶたん
                int ok = -1;
                int ng = cum_b.Length;
                while (Abs(ok - ng) > 1)
                {
                    int mid = (ok + ng) / 2;

                    if (isOK(mid, rem, cum_b)) ok = mid;
                    else ng = mid;
                }
                cnt += ok;

                ans = Max(ans, cnt);
            }
            WriteLine(ans);
        }

        public static bool isOK(int index, long key, long[] cum)
        {
            if (cum[index] <= key) return true;
            else return false;
        }
    }

    public class IO
    {
        #region Input
        public static int RInt => int.Parse(ReadLine());
        public static long RLong => long.Parse(ReadLine());
        public static double RDouble => double.Parse(ReadLine());

        public static string[] RSString => ReadLine().Split();
        public static int[] RSInt => ReadLine().Split().Select(s => int.Parse(s)).ToArray();
        public static long[] RSLong => ReadLine().Split().Select(s => long.Parse(s)).ToArray();
        public static double[] RSDouble => ReadLine().Split().Select(s => double.Parse(s)).ToArray();
        #endregion

        #region Output
        public static void OutJoinSpace<T>(IEnumerable<T> list) => WriteLine(string.Join(" ", list));
        public static void WriteLineYes_or_No(bool flag) => WriteLine(flag ? "Yes" : "No");
        public static void WriteLineYES_or_NO(bool flag) => WriteLine(flag ? "YES" : "NO");
        #endregion
    }

    public class Mod
    {
        #region
        private readonly static long M = 1000000007;

        public static long Add(long a, long b) => (a * b) % M;
        public static long Sub(long a, long b) => (a - b) % M >= 0 ? (a - b) % M : (a - b) % M + M;
        public static long Multi(long a, long b) => (a * b) % M;
        #endregion
    }
}

Measured memory_bytes: 62396