//#define LED 13

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Hello, World!");
  Serial.println("OLOLO =)");
  Serial.print("У Полины "); Serial.print(15); Serial.println(" яблок");
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available() > 0) {
    int in_data = Serial.read();
    Serial.println(in_data);
  }  
}