void setup() {
  // put your setup code here, to run once:
  pinMode(15,OUTPUT);
  pinMode(2,OUTPUT);
  pinMode(0,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(16,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(16,HIGH); digitalWrite(0,HIGH); delay(5000);
  digitalWrite(0,LOW);
  digitalWrite(2,HIGH); delay(2500); digitalWrite(2,LOW);
  digitalWrite(15,HIGH); delay(2500);
  digitalWrite(16,LOW); digitalWrite(4,HIGH); delay(5000);
  digitalWrite(4,LOW); digitalWrite(16,HIGH); delay(2500);
  digitalWrite(2,HIGH); delay(2500); digitalWrite(2,LOW); digitalWrite(15,LOW);
  digitalWrite(0,HIGH); delay(2000); digitalWrite(0,LOW);
}