local function getgcd(x, y)
  while 0LL < x do
    x, y = y % x, x
  end
  return y
end

local function getlcm(x, y)
  local gcd = getgcd(x, y)
  return (x / gcd) * y
end

local x1, y1 = io.read("*n", "*n")
local x2, y2 = io.read("*n", "*n")
local x3, y3 = io.read("*n", "*n")
local v = x1 * 1LL
y1 = y1 * 1LL
if v == 0LL then v = y1 end
x2 = x2 * 1LL
y2 = y2 * 1LL
x3 = x3 * 1LL
y3 = y3 * 1LL
local f = false
for irep = 1, 2000000 do
  if v % y2 == x2 then f = true break end
  v = v + y1
end
if not f then print(-1) os.exit() end
local lcm = getlcm(y1, y2)
f = false
for irep = 1, 2000000 do
  if v % y3 == x3 then f = true break end
  v = v + lcm
  if v < 0LL then break end
end
if not f then print(-1) os.exit() end
v = tostring(v):gsub("LL", "")
print(v)