local mfl, mce = math.floor, math.ceil
local mod = 1
local function bmul(x, y)
  local x1, y1 = x % 10000, y % 10000
  local x2, y2 = mfl(x / 10000) % 10000, mfl(y / 10000) % 10000
  local x3, y3 = mfl(x / 100000000), mfl(y / 100000000)
  local ret = (x1 * y1 + (x1 * y2 + x2 * y1) * 10000) % mod
  ret = (ret + (x1 * y3 + x2 * y2 + x3 * y1) * 10000 % mod * 10000 % mod) % mod
  ret = (ret + (x2 * y3 + x3 * y2) * 10000 % mod * 10000 % mod * 10000) % mod
  ret = (ret +  x3 * y3 * 10000 % mod * 10000 % mod * 10000 % mod * 10000) % mod
  return ret
end

local function modpow(src, pow)
  local res = 1
  while 0 < pow do
    if pow % 2 == 1 then
      res = bmul(res, src)
      pow = pow - 1
    end
    src = bmul(src, src)
    pow = mfl(pow / 2)
  end
  return res
end

local function modinv(src)
  return modpow(src, mod - 2)
end

local n, m, p, q = io.read("*n", "*n", "*n", "*n")
mod = p
local a = mfl(m / p)
local rem = m - p * a
for iq = 1, q do
  local x, f = io.read("*n", "*n")
  x = x % mod
  if x == 0 then
    if f == 0 then
      print(m)
    else
      print(0)
    end
  else
    local v = bmul(f, modinv(x))
    if v == 0 then v = p end
    if v <= rem then
      print(a + 1)
    else
      print(a)
    end
  end
end