int LEDPins[] = {8,4,2,13};

int timer = 1500; 
int quickTimer = 500; 

int countOFpin = 3;          
int blinkCount = 4;


void setup() {
  for (int PIN = 0; PIN < (countOFpin+1); PIN= PIN + 1)
{  
    pinMode(LEDPins[PIN], OUTPUT);  
  }
}

void loop() {
  {  
  // loop starting from the lowest pin in the array to the highest:  
  for (int PIN = 0; PIN < countOFpin; PIN++) 
  {  
    // turns the pin ON:  
    digitalWrite(LEDPins[PIN], HIGH);  
    delay(timer);  
    // turnS the pin OFF:  
    digitalWrite(LEDPins[PIN], LOW); 

  
    if(LEDPins[PIN] == 2)

    {

      for(int blinkCounter=0; blinkCounter <= blinkCount; blinkCounter++)
      {
    // turns the pin ON: 
        digitalWrite(LEDPins[PIN], HIGH);  
        digitalWrite(LEDPins[PIN+1], HIGH);  
        delay(quickTimer);  
    // turnS the pin OFF:  
        digitalWrite(LEDPins[PIN], LOW); 
         digitalWrite(LEDPins[PIN+1], LOW); 
        delay(quickTimer);  
      } 
    }
  }
   // loop from the highest pin in the array to the lowest:   
  // It means the LEDs will light in the reverse direction as used above 
  for (int PIN = countOFpin - 2; PIN >= 0; PIN--) 
  {
    digitalWrite(LEDPins[PIN], HIGH);  
    delay(timer);  
    digitalWrite(LEDPins[PIN], LOW);  
  }

}

}