local a, b, s = io.read("*n", "*n", "*n")
if(s == 1) then
  print(math.abs(a - 1) + 1)
else
  if(math.abs(a - s) <= math.abs(b - s)) then
    print(math.abs(a - s) + s)
  else
    if(a == 0) then
      print(math.abs(b - s) + math.abs(s - 1) + 2)
    else
      print(math.abs(b - s) + math.abs(a - s) + a)
    end
  end
end