Dog Jumping Barricade

 z = int(input())

for _ in range(z):

    j,s,n = [int(x) for x in input().split()]

    a = [int(x) for x in input().split()]

    c = 0

    for i in range(n):

        k = 1

        d = j

        while d < a[i]:

            d = (d-s)+j

            k+=1

        c+=k

    print(c)