package com.anu.game;



import java.io.*;
import java.util.*;

public class Solution {
    

    static int twoStacks(int x, int[] a, int[] b) {
        int bIdx = 0;
        int sumRemoved = 0;

        while (bIdx < b.length && sumRemoved + b[bIdx] <= x) {
            sumRemoved += b[bIdx];
            bIdx++;
        }

        int numRemoved = bIdx;


        for (int aIdx = 0; aIdx < a.length; aIdx++) {
            sumRemoved += a[aIdx];

            while (sumRemoved > x && bIdx > 0) {
                bIdx--;
                sumRemoved -= b[bIdx];
            }

            if (sumRemoved > x) {
                break;
            }

            numRemoved = Math.max(numRemoved, aIdx + bIdx + 1);
        }

        return numRemoved;

    }




    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("good"));

        int g = Integer.parseInt(scanner.nextLine().trim());

        for (int gItr = 0; gItr < g; gItr++) {
            String[] nmx = scanner.nextLine().split(" ");

            int n = Integer.parseInt(nmx[0].trim());

            int m = Integer.parseInt(nmx[1].trim());

            int x = Integer.parseInt(nmx[2].trim());

            int[] a = new int[n];

            String[] aItems = scanner.nextLine().split(" ");

            for (int aItr = 0; aItr < n; aItr++) {
                int aItem = Integer.parseInt(aItems[aItr].trim());
                a[aItr] = aItem;
            }

            int[] b = new int[m];

            String[] bItems = scanner.nextLine().split(" ");

            for (int bItr = 0; bItr < m; bItr++) {
                int bItem = Integer.parseInt(bItems[bItr].trim());
                b[bItr] = bItem;
            }

            int result = twoStacks(x, a, b);

            bufferedWriter.write(String.valueOf(result));
            bufferedWriter.newLine();
        }

        bufferedWriter.close();
    }
}