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 n, p = io.read("*n", "*n")
local ret = 0
local sum = 0
local z1, z2 = 0, 1
for i = 2, n do
  sum = badd(sum, z2)
  ret = badd(ret, bmul(z2, sum))
  z1, z2 = z2, badd(z1, bmul(p, z2))
end
print(ret)