n, m, p, q = map(int, input().split())
for _ in range(q):
    x, f = map(int, input().split())
    count = 0
    start_index = -1
    for y in range(1, p+1):
        c = (x * y) % p
        if c == f:
            start_index = y
            break
    if start_index == -1:
        print(0)
        continue
    show = m // p
    if m % p >= start_index:
        show += 1
    print(show)