void setup() {

  Serial.begin(9600);

  //configure pin 2,3,4 and 5 as an input and enable the internal pull-up resistor
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);

  // built in LED
  pinMode(13, OUTPUT);

}

void loop() {

  //read the pushbutton value into a variable

  int sensorVal2 = digitalRead(2);
  int sensorVal3 = digitalRead(3);
  int sensorVal4 = digitalRead(4);
  int sensorVal5 = digitalRead(5);

  //print out the value of the pushbutton

  Serial.print("Button state: ");
  Serial.print(sensorVal2);
  Serial.print(sensorVal3);
  Serial.print(sensorVal4);
  Serial.print(sensorVal5);
  Serial.print('\n');

  // Keep in mind the pull-up means the pushbutton's logic is inverted. It goes
  // HIGH when it's open, and LOW when it's pressed. Turn on pin 13 when the
  // button's pressed, and off when it's not:

  if (sensorVal2 == LOW or sensorVal3 == LOW or sensorVal4 == LOW or sensorVal5 == LOW) {
    digitalWrite(13, HIGH);
  } else {
    digitalWrite(13, LOW);
  }

  delay(200);
}