void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);

}

void loop() {
  digitalWrite(5, HIGH);
  delay(200);
  digitalWrite(5, LOW);
  digitalWrite(4, HIGH);
  delay(200);
  digitalWrite(4, LOW);
  digitalWrite(3, HIGH);
  delay(200);
digitalWrite(3, LOW);
digitalWrite(2,HIGH);
delay(200);
digitalWrite(2,LOW);

}