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 ffi = require("ffi")
local C = ffi.C
ffi.cdef[[
long long atoll(const char*);
]]

local function lltonumber(str)
  return C.atoll(str)
end
local m = io.read()
m = lltonumber(m) - 1LL

local n = 2
local mat = {}
local tmpmat = {}
for i = 1, n do
  tmpmat[i] = {}
  mat[i] = {}
end
local vec = {}
local tmpvec = {}

vec[1] = 1
vec[2] = 0
mat[1][1] = 1
mat[1][2] = 1
mat[2][1] = 1
mat[2][2] = 0

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
while 0LL < m do
  if m % 2LL == 1LL then
    matvec()
  end
  matmat()
  m = m / 2LL
end
local ans = (vec[1] + vec[2] + mod - 1) % mod
print(ans)