local mod = 998244353
local mfl = math.floor
local function bmul(x, y)
  local x0, y0 = x % 31596, y % 31596
  local x1, y1 = mfl(x / 31596), mfl(y / 31596)
  return (x1 * y1 * 62863 + (x1 * y0 + x0 * y1) * 31596 + 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

--[[
!! (for Multiple)
y1         1 0 0 0 1 0   x1
y2         1 2 0 1 1 0   x2
y3 = 1/6 * 1 0 2 0 1 0 * x3
y4         1 1 0 2 1 0   x4
y5         1 0 0 0 1 0   x5
y0         1 1 1 1 1 1   x0
]]
local pw, pos = io.read("*n", "*n")
local n = 6
if pos == 0 then pos = 6 end

local tmpmat = {}
local mat = {}
for i = 1, n do
  tmpmat[i] = {}
  mat[i] = {1, 1, 1, 1, 1, 1}
end
local vec = {0, 0, 0, 0, 0, 1}

local tmpvec = {}

local function matmat()
  for i = 1, n do
    for j = 1, n do
      local v = 0
      for k = 1, n do
        v = badd(v, bmul(mat[i][k], mat[k][j]))
      end
      tmpmat[i][j] = v
    end
  end
  for i = 1, n do for j = 1, n do
    mat[i][j] = tmpmat[i][j]
  end end
end

local function matvec()
  for i = 1, n do
    local v = 0
    for k = 1, n do
      v = badd(v, bmul(mat[i][k], vec[k]))
    end
    tmpvec[i] = v
  end
  for i = 1, n do
    vec[i] = tmpvec[i]
  end
end

local nn = pw
while true do
  if nn % 2 == 1 then
    matvec()
    nn= nn - 1
  end
  if nn == 0 then break end
  nn = mfl(nn / 2)
  matmat()
end
local denom = modinv(modpow(6, pw))
print(bmul(denom, vec[pos]))