void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
}

void loop() {
  digitalWrite(13,HIGH);
  delay(1000);
  digitalWrite(13, LOW);
  digitalWrite(12,HIGH);
  delay(1000);
  digitalWrite(12, LOW);
  digitalWrite(11,HIGH);
  delay(1000);
  digitalWrite(11, LOW);
  digitalWrite(10,HIGH);
  delay(1000);
  digitalWrite(10, LOW);
  digitalWrite(9,HIGH);
  delay(1000);
  digitalWrite(9, LOW);
  digitalWrite(8,HIGH);
  delay(1000);
  digitalWrite(8, LOW);
  digitalWrite(7,HIGH);
  delay(1000);
  digitalWrite(7, LOW);
  digitalWrite(6,HIGH);
  delay(1000);
  digitalWrite(6, LOW);
  digitalWrite(7,HIGH);
  delay(1000);
  digitalWrite(7, LOW);
  digitalWrite(8,HIGH);
  delay(1000);
  digitalWrite(8, LOW);
  digitalWrite(9,HIGH);
  delay(1000);
  digitalWrite(9, LOW);
  digitalWrite(10,HIGH);
  delay(1000);
  digitalWrite(10, LOW);
  digitalWrite(11,HIGH);
  delay(1000);
  digitalWrite(11, LOW);
  digitalWrite(12,HIGH);
  delay(1000);
  digitalWrite(12, LOW);
  digitalWrite(13,HIGH);
  delay(1000);
  digitalWrite(13, LOW);
}