// Source : https://arduinogetstarted.com/reference/serial-parseint
void setup() {
  Serial.begin(9600);
  Serial.println("Serial parseInt()");
}

void loop() {
  if (Serial.available() > 0) {
    long myInt = Serial.parseInt(SKIP_ALL, '\n');

    // prints the received integer
    Serial.print("I received: ");
    Serial.println(myInt);
  }
}