void setup() {
  // put your setup code here, to run once:
  pinMode(2,OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4,OUTPUT) ;
  pinMode(5,OUTPUT) ;

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2,HIGH) ;
  delay(1000);
  digitalWrite(3,HIGH) ;
  delay(1000);
  digitalWrite(4,HIGH) ;
  delay(1000);
  digitalWrite(5, HIGH);
  delay(1000);
  digitalWrite(2,LOW) ;
  digitalWrite(3,LOW) ;
  digitalWrite(4,LOW) ;
  digitalWrite(5,LOW) ;

}