for t in range(int(input())):
    n,k,m = map(int, input().split())
    p = list(map(int,input().split()))
    p.sort()

    total = 0
    for i in p[:k]:
        total += i


    if total == 0 or total < n:
        print(0)
    else:
        total -= n
        print(total)