int redpin = 13;
int yellowpin = 12;
int greenpin = 11;
void setup() {
  pinMode(redpin, OUTPUT);
  pinMode(yellowpin, OUTPUT);
  pinMode(greenpin, OUTPUT);
  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(greenpin, HIGH);
  digitalWrite(yellowpin, LOW);
  digitalWrite(redpin, LOW);
  // put your main code here, to run repeatedly:
  delay(5000);
  digitalWrite(greenpin , LOW);
  digitalWrite(yellowpin , HIGH);
  digitalWrite(redpin , LOW);
  delay(3000);
  digitalWrite(greenpin , LOW);
  digitalWrite(yellowpin , LOW);
  digitalWrite(redpin , HIGH);
  delay(8000);
}