local n = io.read("*n")
local a = {}
local b = {}
for i = 1, n do
  a[i] = io.read("*n")
end
for i = 1, n do
  b[i] = io.read("*n")
end
local t = {0}
for i = 1, n do
  if a[i] == b[i] then
    table.insert(t, i)
  end
end
table.insert(t, n + 1)
c = 0
for i = 1, #t - 1 do
  if 1 < t[i + 1] - t[i] then
    c = c + 1
  end
end
print(c)