#define LED_BUILTIN 13
#define led1 12
#define led2 11
void setup() {
  pinMode(LED_BUILTIN,OUTPUT);
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(500);
  digitalWrite(LED_BUILTIN, LOW);
  digitalWrite(led1, HIGH);
  delay(500);
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
  delay(500);
  digitalWrite(led2, LOW);
  // put your main code here, to run repeatedly:

}