int bank;
int opak;
int pauz1 = 500;
int pauz2 = 150;
int pauz3 = 1000;
int pauz4 = 2000;


void setup() {

  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  // put your setup code here, to run once:

}

void loop() {
 for(opak=0;opak<=4;opak++)
 {
  for(bank=4;bank>=2;bank--)
  {
    digitalWrite(bank,1);
    delay(pauz1);
    digitalWrite(bank,0);
    delay(pauz1);
    }
    delay(1000);
    for(bank=2;bank<=4;bank++)
  {
    digitalWrite(bank,1);
    delay(pauz2);
    digitalWrite(bank,0);
    delay(pauz2);
    }
  // put your main code here, to run repeatedly:
delay(1000);
}

 for(opak=0;opak<=4;opak++)
 {
  for(bank=2;bank<=4;bank++)
  {
    digitalWrite(bank,1);
    delay(pauz3);
    digitalWrite(bank,0);
    delay(pauz3);
    }
    delay(1000);
    for(bank=2;bank<=4;bank++)
  {
    digitalWrite(bank,1);
    delay(pauz4);
    digitalWrite(bank,0);
    delay(pauz4);
    }
  // put your main code here, to run repeatedly:
delay(1000);
}
}