rgbw arduino

int redLed = 3;
int greenLed = 5;
int blueLed = 6;
int whiteLed = 9;

void setup() {
  Serial.begin(9600);    // initialize serial communications
  Serial.setTimeout(10); // set the timeout for parseInt

  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(whiteLed, OUTPUT);
}

void loop() {
  if (Serial.available() > 0) {   // if there's serial data available

    int red = Serial.parseInt();
    int newRed = map(red, 255, 0, 0, 255);

    int green = Serial.parseInt();
    int newGreen = map(green, 255, 0, 0, 255);

    int blue = Serial.parseInt();
    int newBlue = map(blue, 255, 0, 0, 255);

    int white = Serial.parseInt();
    int newWhite = map(white, 255, 0, 0, 255);

    if (Serial.read() == '\n') {
      analogWrite(redLed, newRed);
      analogWrite(greenLed, newGreen);
      analogWrite(blueLed, newBlue);
      analogWrite(whiteLed, newWhite);
    }
  }
}