local mod = 1000000007
local mfl = math.floor

local function bmul(x, y)
  local x0, y0 = x % 31623, y % 31623
  local x1, y1 = mfl(x / 31623), mfl(y / 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 b, c, d = io.read("*n", "*n", "*n")
if c % mod == 0 then
  print(0)
elseif c % mod == 1 then
  print(bmul(b % mod, d % mod))
else
  c = c % mod
  local ret = bmul(b % mod, c)
  -- (c^d - 1) / (c - 1)
  d = d % (mod - 1)
  ret = bmul(ret, bsub(modpow(c, d), 1))
  ret = bmul(ret, modinv(c - 1))
  print(ret)
end