int Rled=3;
int Yled=2;
int Gled=1;




void setup() {
pinMode(Rled,OUTPUT);
pinMode(Yled,OUTPUT);
pinMode(Gled,OUTPUT);


  // put your setup code here, to run once:

}

void loop() {
digitalWrite(Rled,HIGH);
delay(2000);
digitalWrite(Rled,LOW);
digitalWrite(Yled,HIGH);
delay(1000);
digitalWrite(Yled,LOW);
digitalWrite(Gled,HIGH);
delay(3000);
digitalWrite(Gled,LOW);
digitalWrite(Yled,HIGH);
delay(1000);
digitalWrite(Yled,LOW);






  // put your main code here, to run repeatedly:

}