// constants won't change. They're used here to set pin numbers:
const int buttonPin = 8; // the number of the pushbutton pin
const int ledPin1 = 3;
const int ledPin2 = 2;
const int ledPin3 = 7;
// variables will change:
int buttonState = 1; // variable for reading the pushbutton status

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

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 off:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);

} else {
// turn LED on:
digitalWrite(ledPin1, HIGH);
delay (2);
digitalWrite(ledPin1, LOW);
delay (2);
digitalWrite(ledPin3, HIGH);
delay (2);
digitalWrite(ledPin3, LOW);
delay (2);
digitalWrite(ledPin2, HIGH);
delay (2);
digitalWrite(ledPin2, LOW);
delay (2);
}
}