void setup() {
  pinMode(2, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  
 
 }

void loop() {
  digitalWrite(2, HIGH);
  delay(1000); 
  digitalWrite(2, LOW);
  delay(1000);

  digitalWrite(4, HIGH);
  delay(1000); 
  digitalWrite(4, LOW);
  delay(1000);

  digitalWrite(5, HIGH);
  delay(1000); 
  digitalWrite(5, LOW);
  delay(1000);
  
}