int taster;

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

  pinMode(8, INPUT_PULLUP);
  pinMode(13, OUTPUT);
}

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

  
  taster = digitalRead(8);

  if (taster == HIGH) {
    digitalWrite(13, LOW);
  } else {
    digitalWrite(13, HIGH);
  }

  digitalWrite(13, !taster);
}