function Main(input) {
  tmp = input.split(" ");
  // convert string from integer using "parseInt"
  var a = parseInt(tmp[0], 10);
  var b = parseInt(tmp[1], 10);

  var num1 = a + (a - 1);
  var num2 = a + b;
  var num3 = b + (b - 1);

  return Math.max(num1, num2, num3);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));