void setup() {
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);

}
void loop() {
  digitalWrite(5, HIGH);  
  digitalWrite(4, HIGH); 
  digitalWrite(3, HIGH);  
  delay(1000); 

  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
  digitalWrite(3, LOW);
  delay(1000);
  
}