void setup() {
}
void loop() {
pinMode(2, OUTPUT);
  delay(300);
  digitalWrite(2, HIGH);
  delay(300);
  pinMode(3, OUTPUT);
  delay(100);
  digitalWrite(3, HIGH);
  delay(300);
  pinMode(4, OUTPUT);
  delay(300);
  digitalWrite(4, HIGH);
  delay(300);
  digitalWrite(2, LOW);
  delay(300);
  digitalWrite(3, LOW);
  delay(300);
  digitalWrite(4, LOW);
  delay(300);
}