import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)
b = 10 ** 9 + 7


def test():
    x, y = map(int, input().split())
    m = int(input())
    A = sorted(map(int, input().split()))

    dp = {x * b + y}
    for i, a in enumerate(A):
        ndp = set()
        for xy in dp:
            x, y = divmod(xy, b)
            if x - a >= 0:
                ndp.add((x - a) * b + y)
            if y - a >= 0:
                ndp.add(x * b + y - a)
        if not ndp:
            return i
        dp = ndp
    return m


d = int(input())
print(*[test() for _ in range(d)], sep="\n")