// constants won't change. They're used here to set pin numbers:
const int buttonPin = 27;  // the number of the pushbutton pin
const int ledPin1 = 26;    // the number of the LED pin
const int ledPin2 = 0;
const int ledPin3 = 1;

// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  pinMode(ledPin1, OUTPUT);  // initialize the LED pin as an output:
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(buttonPin, INPUT); // initialize the pushbutton pin as an input:
}

void loop() {
    buttonState = digitalRead(buttonPin);  // read the state of the pushbutton value:
  if (buttonState == HIGH) {    // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
    digitalWrite(ledPin1, HIGH);  // turn LED on:
    delay(1000);
    digitalWrite(ledPin2, HIGH);
    delay(1000);
    digitalWrite(ledPin3, HIGH);
    delay(1000);
  } else {
    digitalWrite(ledPin1, LOW);   // turn LED off:
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW);
  }
}