void setup() {
  // put your setup code here, to run once:
pinMode(13, INPUT);
pinMode(12, INPUT);
pinMode(11, INPUT);
pinMode(10, INPUT);
pinMode(9, INPUT);
pinMode(8, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(13, HIGH);
delay(200);
digitalWrite(13, LOW);
delay(200);
digitalWrite(12, HIGH);
delay(200);
digitalWrite(12, LOW);
delay(200);
digitalWrite(11, HIGH);
delay(200);
digitalWrite(11, LOW);
delay(200);
digitalWrite(10, HIGH);
delay(200);
digitalWrite(10, LOW);
delay(200);
digitalWrite(9, HIGH);
delay(200);
digitalWrite(9, LOW);
delay(200);
digitalWrite(8, HIGH);
delay(200);
digitalWrite(8, LOW);
delay(200);
}