const int buttonPin = 27;  // the number of the pushbutton pin
const int ledPin_1 = 26;    // the number of the LED pin
const int ledPin_2 = 0;
const int ledPin_3 = 1;
// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin_1, OUTPUT);
  pinMode(ledPin_2, OUTPUT);
  pinMode(ledPin_3, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin_1, HIGH);
    digitalWrite(ledPin_2, HIGH);
    digitalWrite(ledPin_3, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin_1, LOW);
    digitalWrite(ledPin_2, LOW);
    digitalWrite(ledPin_3, LOW);
  }
}