#define led1Pin 2
#define led2Pin 3
#define led3Pin 4
#define led4Pin 5

void setup() {
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(led4Pin, OUTPUT);

  initialization();
  
}

void loop() {
   for(int i=2; i<6; i++){
      digitalWrite(i, HIGH);
      delay(1000);
   }
   delay(2000);
   digitalWrite(led1Pin, LOW);
   digitalWrite(led2Pin, LOW);
   digitalWrite(led3Pin, LOW);
   digitalWrite(led4Pin, LOW);
   delay(1000);

}

void initialization() {
  for(int i=0; i < 5; i++){
    digitalWrite(led1Pin, HIGH);
    digitalWrite(led2Pin, HIGH);
    digitalWrite(led3Pin, HIGH);
    digitalWrite(led4Pin, HIGH);
    delay(500);
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, LOW);
    digitalWrite(led4Pin, LOW);
    delay(500);
  }
  
}