local mod = 1000000007
local mfl = math.floor

local function bmul(x, y)
  local x1, y1 = mfl(x / 31623), mfl(y / 31623)
  local x0, y0 = x - x1 * 31623, y - y1 * 31623
  return (x1 * y1 * 14122 + (x1 * y0 + x0 * y1) * 31623 + x0 * y0) % mod
end

local function badd(x, y) return (x + y) % mod end

local function bsub(x, y)
  return x < y and x - y + mod or x - y
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 = io.read("*n")
local ret = 1
for i = 1, n do
  local a = 1
  local p, e = io.read("*n", "*n")
  local pe1 = modpow(p, e + 1)
  local numer = bsub(pe1, 1)
  local denom = p - 1
  local d2 = modinv(denom)
  a = bmul(numer, d2)
  local b = bmul(1 + e, a)
  local c = bsub(a, bmul(e, pe1))
  c = bsub(c, 1)
  c = bmul(c, d2)
  local e = badd(b, c)
  -- print(e)
  ret = bmul(ret, e)
end
print(ret)