const int rojito = 2;
const int amarillito = 15;
const int verdito = 13;

void setup() {
  pinMode(rojito, OUTPUT);
  pinMode(amarillito, OUTPUT);
  pinMode(verdito, OUTPUT);
}

void loop() {
  digitalWrite(rojito, HIGH);
  digitalWrite(amarillito, LOW);
  digitalWrite(verdito, LOW);
  delay(5000);

  digitalWrite(rojito, LOW);
  digitalWrite(amarillito, HIGH);
  digitalWrite(verdito, LOW);
  delay(2000);

  digitalWrite(rojito, LOW);
  digitalWrite(amarillito, LOW);
  digitalWrite(verdito, HIGH);
  delay(5000);

  digitalWrite(rojito, LOW);
  digitalWrite(amarillito, HIGH);
  digitalWrite(verdito, LOW);
  delay(2000);

  for (int i = 0; i < 6; i++) {
    digitalWrite(amarillito, HIGH);
    digitalWrite(rojito, LOW);
    digitalWrite(verdito, LOW);
    delay(500);
    digitalWrite(amarillito, LOW);
    delay(500);
  }
}