int i=0;


void setup() {
  // put your setup code here, to run once:

  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(8, OUTPUT);

  Serial.begin(9600);
  Serial.println("Hola mundo");

}

void loop() {
  // put your main code here, to run repeatedly:

  
  for (i=1; i<100; i++)
  {
    delay(1000);
    digitalWrite(12, LOW);
    digitalWrite(8, LOW);

    if (i%3)
    {
      Serial.print(i);
      Serial.println(" no multiplo");
      digitalWrite(8, HIGH);
      

    }
    else
    {
      Serial.print(i);
      Serial.println(" multiplo de 3");
      digitalWrite(12, HIGH);
      
    }
  
  }
  
}