class Flasher{
  int ledPin;
  long OnTime;
  long OffTime;

  int ledState;
  unsigned long previousMillis;

  public:
  Flasher(int pin, long on, long off){
    ledPin = pin;
    pinMode(ledPin, OUTPUT);

    OnTime = on;
    OffTime = off;  // Corrected assignment

    ledState = LOW;
    previousMillis = 0;
}

  void Update(){
    unsigned long currentMillis = millis();
    if((ledState == HIGH) && (currentMillis - previousMillis >= OnTime)){
      ledState = LOW;
      previousMillis = currentMillis;
      digitalWrite(ledPin, ledState);
    }else if ((ledState == LOW) && (currentMillis - previousMillis >= OffTime)){
      ledState = HIGH;
      previousMillis = currentMillis;
      digitalWrite(ledPin, ledState);
    }
  }
};

Flasher led1(13, 100, 400);
Flasher led2(12, 350, 350);
Flasher led3(11, 300, 400);
Flasher led4(10, 400, 400);

void setup() {
}

void loop() {
  led1.Update();
  led2.Update();
  led3.Update();
  led4.Update();
}