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

namespace AtCoder.Question
{
    public class QuestionC
    {
        public static void Main(string[] args)
        {
            var (n, m, k) = ReadHelper.ReadValue<int, int, long>();
            var a = ReadHelper.ReadValues<long>();
            var b = ReadHelper.ReadValues<long>();

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

            var result = sumA.Select((x, i) => (x, i)).Where(x => x.x <= k).Last().i;
            for (int i = 0; i < sumA.Length; i++)
            {
                if (sumA[i] > k)
                {
                    break;
                }
                if (sumB.Length <= result - i || result - i < 0)
                {
                    continue;
                }
                if (sumA[i] + sumB[result - i] > k)
                {
                    continue;
                }
                for (int j = result - i; j < sumB.Length; j++)
                {
                    if (sumA[i] + sumB[j] > k)
                    {
                        break;
                    }
                    if (result < i + j)
                    {
                        result = i + j;
                    }
                }
            }

            Console.WriteLine(result);
        }

        static class ReadHelper
        {
            internal static T ReadValue<T>()
            {
                return (T)Convert.ChangeType(Console.ReadLine(), typeof(T));
            }
            internal static (T1, T2) ReadValue<T1, T2>()
            {
                var input = Console.ReadLine().Split(' ');
                return ((T1)Convert.ChangeType(input[0], typeof(T1)), (T2)Convert.ChangeType(input[1], typeof(T2)));
            }
            internal static (T1, T2, T3) ReadValue<T1, T2, T3>()
            {
                var input = Console.ReadLine().Split(' ');
                return ((T1)Convert.ChangeType(input[0], typeof(T1)), (T2)Convert.ChangeType(input[1], typeof(T2)), (T3)Convert.ChangeType(input[2], typeof(T3)));
            }
            internal static (T1, T2, T3, T4) ReadValue<T1, T2, T3, T4>()
            {
                var input = Console.ReadLine().Split(' ');
                return ((T1)Convert.ChangeType(input[0], typeof(T1)), (T2)Convert.ChangeType(input[1], typeof(T2)), (T3)Convert.ChangeType(input[2], typeof(T3)), (T4)Convert.ChangeType(input[3], typeof(T4)));
            }
            internal static T[] ReadValues<T>()
            {
                var input = Console.ReadLine().Split(' ');
                return input.Select(x => (T)Convert.ChangeType(x, typeof(T))).ToArray();
            }
        }

        static class MathAlgorithm
        {
            internal static bool IsPrime(long n)
            {
                if (n == 2) return true;
                if (n < 2 || n % 2 == 0) return false;
                var sqrt = Math.Sqrt(n);
                for (int i = 3; i <= sqrt; i += 2) if (n % i == 0) return false;
                return true;
            }
            internal static IEnumerable<long> EnumeratePrimes(long n)
            {
                var i = 2L;
                while (i * i <= n)
                {
                    if (n % i == 0)
                    {
                        n /= i;
                        yield return i;
                    }
                    else
                    {
                        i += i == 2 ? 1 : 2;
                    }
                }
                if (n != 1) yield return n;
            }
        }
    }
}


Measured memory_bytes: 79552