#define red 2
void setup() {
  // put your setup code here, to run once:
pinMode(LED_BUILTIN,OUTPUT);
pinMode(13,OUTPUT);
}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(LED_BUILTIN, HIGH);
digitalWrite(red, HIGH);
delay(500);

digitalWrite(LED_BUILTIN, LOW);
digitalWrite(red, HIGH);
delay(500);
}