int LEDG = 12;

int LEDY = 13;

int LEDR = 8;

void setup() {
  // put your setup code here, to run once:
 pinMode(LEDG, OUTPUT);

 pinMode(LEDY, OUTPUT);

 pinMode(LEDR, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 semafor1 ();

 
}
void semafor1 () {
   digitalWrite(LEDG, HIGH);
 delay(3000);
 digitalWrite(LEDG, LOW);
 
 digitalWrite(LEDY, HIGH);
 delay(1000);
 digitalWrite(LEDY, LOW);
 delay(1000);
 digitalWrite(LEDY, HIGH);
  delay(1000);
 digitalWrite(LEDY, LOW);
 delay(1000);
 digitalWrite(LEDY, HIGH);
 delay(1000);
 digitalWrite(LEDY, LOW);

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

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

  digitalWrite(LEDG, HIGH);
 delay(3000);
 digitalWrite(LEDG, LOW);
  
}