local mfl, mce = math.floor, math.ceil

local a, b, c = io.read("*n", "*n", "*n")
if c == 1 then print(0) os.exit() end

local function modpow(src)
  local pow = b
  local res = 1
  while 0 < pow do
    if pow % 2 == 1 then
      res = (res * src) % c
      pow = pow - 1
    end
    src = (src * src) % c
    pow = mfl(pow / 2)
  end
  return res
end
local t = {1}
for i = 2, c - 1 do
  t[i] = (t[i - 1] + modpow(i)) % c
end
local mul = mfl(a / c)
local rem = a % c
local ret = (t[c - 1] * mul) % c
if 0 < rem then
  ret = (ret + t[rem]) % c
end
print(ret)