n, m, p, q = map(int, input().split())

for i in range(q):
    x, f = map(int, input().split())
    x %= p
    if f == 0:
        if x == 0:
            print(m)
        else:
            print(m // p)
    else:
        if x == 0:
            print(0)
            continue

        t = pow(x, p-2, p) * f % p
        print((m+p-t)//p)