a, b = io.read("*n", "*n")
if a == 0 then
  print(b)
elseif 0 < a then
  if 0 <= b then
    print(a .. b)
  else
    print(a + b)
  end
else
  if 0 <= b then
    print(a .. b)
  else
    print(a + b)
  end
end