void setup() {
  pinMode(13, OUTPUT); // Red LED
  pinMode(12, OUTPUT); // Blue LED
  pinMode(11, OUTPUT); // Yellow LED
}
int red=1;
int blue=2;
int yellow =3;
void loop() {
  // Cycle through colors every 1000ms
  for (int i = 1; i < 5000; i++) {
    if (red ==i) { // Red
      digitalWrite(13, HIGH);
      delay(1000);
      digitalWrite(13, LOW);
      continue;
    } 
    else if (blue==i) { // Blue
      digitalWrite(12, HIGH);
      delay(1000);
      digitalWrite(12, LOW);
            continue;

    } 
    else { // Yellow
      digitalWrite(11, HIGH);
      delay(1000);
      digitalWrite(11, LOW);
          

    }
    red= red+3;
    blue=blue+3;
    yellow = yellow+3;
  }
}