int R = 13, Y = 12, G = 11;

void setup() {
  // put your setup code here, to run once:
  // pinMode(LED, OUTPUT);
  pinMode(R, OUTPUT);
  pinMode(Y, OUTPUT);
  pinMode(G, OUTPUT);
}

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

  // Red
  digitalWrite(R, HIGH);
  delay(500);
  digitalWrite(R, LOW);

  // Yellow
  digitalWrite(Y, HIGH);
  delay(700);
  digitalWrite(Y, LOW);

  // Green
  digitalWrite(G, HIGH);
  delay(1000);
  digitalWrite(G, LOW);

}