int redPin = 13;
int yellowPin = 12;
int greenPin = 11;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50);
  
  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 

  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50);
  
  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 

  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 

  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 

  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 
  
  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 

  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 

  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 

  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50);
  
  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 

  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 

  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 

  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 

  digitalWrite(redPin, HIGH);
  delay(50); 
  digitalWrite(redPin, LOW);
  delay(50); 

  digitalWrite(yellowPin, HIGH);
  delay(50); 
  digitalWrite(yellowPin, LOW);
  delay(50); 
  
  digitalWrite(greenPin, HIGH);
  delay(50); 
  digitalWrite(greenPin, LOW);
  delay(50); 

  digitalWrite(redPin, HIGH);
  delay(200); 
  digitalWrite(redPin, LOW);
  delay(200); 

  for (int k = 0; k < 5; k++) { 
    digitalWrite(redPin, HIGH);
    delay(300);
    digitalWrite(redPin, LOW);
    delay(500);

    digitalWrite(redPin, HIGH);
    delay(100);
    digitalWrite(yellowPin, HIGH);
    delay(300);
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, LOW);
    delay(300);

    digitalWrite(redPin, HIGH);
    delay(100);
    digitalWrite(yellowPin, HIGH);
    delay(100);
    digitalWrite(greenPin, HIGH);
    delay(500);
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, LOW);
    digitalWrite(greenPin, LOW);
    delay(500);
  }

  digitalWrite(redPin, HIGH);
  delay(200); 
  digitalWrite(redPin, LOW);
  delay(200); 
  
  digitalWrite(yellowPin, HIGH);
  delay(200); 
  digitalWrite(yellowPin, LOW);
  delay(200); 

  digitalWrite(greenPin, HIGH);
  delay(200); 
  digitalWrite(greenPin, LOW);
  delay(200); 

}