#define GREEN_LED 12
#define RED_LED 27
#define YELLOW_LED 14

void setup() {
  pinMode(GREEN_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
}

void loop() {
  digitalWrite(RED_LED, HIGH);
  delay(7000);
  digitalWrite(RED_LED, LOW);

  digitalWrite(YELLOW_LED, HIGH);
  delay(3000);
  digitalWrite(YELLOW_LED, LOW);

  digitalWrite(GREEN_LED, HIGH);
  delay(7000);
  digitalWrite(GREEN_LED, LOW);


}