void setup() {
  // put your setup code here, to run once:
pinMode(13,OUTPUT);
pinMode(10,OUTPUT);
pinMode(8,OUTPUT);
pinMode(6,OUTPUT);
pinMode(4,OUTPUT);
}
void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(13, HIGH);
  delay(500);
  digitalWrite(13, LOW);
  delay(500);

  digitalWrite(10, HIGH);
  delay(500);
  digitalWrite(10, LOW);
  delay(500);

  digitalWrite(8, HIGH);
  delay(500);
  digitalWrite(8, LOW);
  delay(500);

  digitalWrite(6, HIGH);
  delay(500);
  digitalWrite(6, LOW);
  delay(500);

  digitalWrite(4, HIGH);
  delay(500);
  digitalWrite(4, LOW);
  delay(500);
}