#define RLED 2 
#define OLED 3 
#define GLED 4 

void setup()
{
  pinMode(RLED, OUTPUT);
  pinMode(OLED, OUTPUT);
  pinMode(GLED, OUTPUT);
}

void loop()
{
  digitalWrite(RLED, HIGH);
  delay(1000);
  digitalWrite(RLED, LOW);
  delay(1000);

  digitalWrite(OLED, HIGH);
  delay(1000);
  digitalWrite(OLED, LOW);
  delay(1000);

   digitalWrite(GLED, HIGH);
  delay(1000);
  digitalWrite(GLED, LOW);
  delay(1000); 
}