function tourAgency(input) {
  let city = input[0];
  let extras = input[1];
  let vip = input[2];
  let numberNights = Number(input[3]);
  let pricePerNight = 0;

  if (numberNights < 1) {
    console.log("Days must be positive number!");
    return;
  }

  if (
    (city !== "Bansko" &&
      city !== "Borovets" &&
      city !== "Varna" &&
      city !== "Burgas") ||
    (extras !== "noEquipment" &&
      extras !== "withEquipment" &&
      extras !== "noBreakfast" &&
      extras !== "withBreakfast")
  ) {
    console.log("Invalid input!");
    return;
  }
  if (numberNights > 7) {
    numberNights -= 1;
  }

  if (city === "Bansko" || city === "Borovets") {
    if (extras === "withEquipment") {
      pricePerNight = 100;
      if (vip === "yes") {
        pricePerNight *= 0.9;
      }
    } else {
      pricePerNight = 80;
      if (vip === "yes") {
        pricePerNight *= 0.95;
      }
    }
  } else if (city === "Varna" || city === "Burgas") {
    pricePerNight = 130;
    if (extras === "withBreakfast") {
      pricePerNight = 130;
      if (vip === "yes") {
        pricePerNight *= 0.88;
      }
    } else {
      pricePerNight = 100;
      if (vip === "yes") {
        pricePerNight * 0.93;
      }
    }
  }
  console.log(
    `The price is ${(numberNights * pricePerNight).toFixed(
      2
    )}lv! Have a nice time!`
  );
}