local n = io.read("*n")
local a, b = {}, {}
for i = 1, n do
  a[i] = io.read("*n")
end
for i = 1, n do
  b[i] = io.read("*n")
end
local function f()
  for i = 1, n do
    if a[i] == 2 then
      local a2cnt = 0
      local a1cnt = 0
      for j = 1, n do
        if a[j] == 1 then
          a1cnt = a1cnt + 1
        elseif a[j] == 2 then
          a2cnt = a2cnt + 1
        end
      end
      local c = a2cnt * n
      local b2exist = false
      for j = 1, n do
        if b[j] == 2 then
          b2exist = true
          c = c + (n - a2cnt)
        end
      end
      if not b2exist then
        c = c + a1cnt
      end
      print(c)
      os.exit()
    end
  end
end
f()
a, b = b, a
f()
local a1cnt = 0
local b1cnt = 0
for i = 1, n do
  if a[i] == 1 then a1cnt = a1cnt + 1 end
end
for i = 1, n do
  if b[i] == 1 then b1cnt = b1cnt + 1 end
end
print(math.max(a1cnt, b1cnt))