void setup() {
  // put your setup code here, to run once:
pinMode (1,OUTPUT);
pinMode (9,OUTPUT);
pinMode (13,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (1, HIGH);
digitalWrite(1, LOW);
digitalWrite(9, HIGH);
digitalWrite(9, LOW);
digitalWrite(13, HIGH);
digitalWrite(13, LOW);
delay(100);
delay(100);
delay(100);
delay(100);
delay(100);
}