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 n = io.read("*n")
local p = {}
local pinv = {}
for i = 1, n do pinv[i] = 0 end
for i = 1, n do
  p[i] = io.read("*n") + 1
  pinv[p[i]] = i
end
if n == 1 then print(1) os.exit() end
local internal_use = 0
local left = pinv[1]
local right = left
do
  local pos = pinv[2]
  if pos < left then left = pos else right = pos end
end
local ret = 1
for i = 3, n do
  local pos = pinv[i]
  if left < pos and pos < right then
    local remain = right - left - 1 - internal_use
    ret = bmul(ret, remain)
    internal_use = internal_use + 1
  else
    if pos < left then
      left = pos
    else
      right = pos
    end
    internal_use = internal_use + 1
  end
end
print(ret)