void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(13, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(13) == LOW){
    Serial.println("Button 13 Pressed!");
    delay(100);
  }
  else if(digitalRead(12) == LOW){
    Serial.println("Button 12 Pressed!");
    delay(100);
  }
  else if(digitalRead(11) == LOW){
    Serial.println("Button 11 Pressed!");
    delay(100);
  }
  delay(100);
}