#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int n1, n2;
vector<int> a;

vector<int> DP;

int n0,sa,n_min;

bool solve(int sum,int first);

int main()
{
    int d,m;
    cin >> d;
    for (int i = 0; i < d; i++) {
        cin >> n1 >> n2;
        cin >> m;
        a.resize(m);
        for (int j = 0; j < m; j++) {
            cin >> a[j];
        }
        sort(a.begin(), a.end());
        n0 = n1 + n2;
        n_min = min(n1, n2);
        int a_sum=0, ans=0;
        for (int j = 0; j < a.size(); j++) {
            if (a_sum + a[j] <= n0) {
                a_sum += a[j];
                ans = j + 1;
            }
            else {
                a.erase(a.begin() + j);
                j--;
            }
        }
        sa = n0 - a_sum;
        DP.assign(100010, 100);
        cout << ans - !solve(0, 0) << endl;
    }
    return 0;
}

bool solve(int sum,int first) {
    for (int i = first; i < a.size(); i++) {
        int tmp;
        tmp = sum + a[i];
        if ((tmp >= n1 - sa&&tmp <= n1) || (tmp >= n2 - sa&&tmp <= n2)) {
            return true;
        }
        else if (tmp > n_min) break;
        if (DP[tmp] < i) continue;
        else {
            DP[tmp] = i;
            if (solve(tmp,i+1)) return true;
        }
    }
    return false;
}