local n = io.read("*n", "*l")
local s = io.read()
local t = io.read()
local f = 0
for i = 1, n do
  if s:sub(i, i) == "1" then f = f + 1 end
  if t:sub(i, i) == "1" then f = f + 1 end
end
if f % 2 == 1 then
  s = s:reverse()
end
local c = 0
for i = 1, n do
  if s:sub(i, i) ~= t:sub(i, i) then
    c = c + 1
  end
end
print(c)