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
for i = 1, n do
  if a[i] == 2 then
    local c = 0
    for j = 1, n do
      if a[j] == 1 then c = c + 1
      elseif a[j] == 2 then c = c + n
      end
    end
    print(c)
    os.exit()
  end
end
for i = 1, n do
  if b[i] == 2 then
    local c = 0
    for j = 1, n do
      if b[j] == 1 then c = c + 1
      elseif b[j] == 2 then c = c + n
      end
    end
    print(c)
    os.exit()
  end
end
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))