const int ledPin = D0;      // the number of the LED pin
const int ledPin1 =  D6;    // the number of the LED pin
const int ledPin2 =  D7;    // the number of the LED pin
const int buttonPin = D1;   // the number of the pushbutton pin 
int buttonState = 0;        // variable for reading the pushbutton status
 
void setup()
{
  pinMode(buttonPin, INPUT);  // Set buttonPin as an input
  pinMode(ledPin, OUTPUT);    // Set ledPin as an output
  pinMode(ledPin1, OUTPUT);   // Set ledPin1 as an output
  pinMode(ledPin2, OUTPUT);   // Set ledPin2 as an output

}

void loop()
{ 
  buttonState = digitalRead(buttonPin); // Read the state of the pushbutton
  if (buttonState == HIGH) {            // If the button is pressed
    for (int i=0; i <= 4; i++)          // Repeat the following block 5 times
      {
        delay(1000);                    // Wait for 1 second
        digitalWrite(ledPin, HIGH);     // Turn on the first LED
        delay(1000);                    // Wait for 1 second
        digitalWrite(ledPin1, HIGH);    // Turn on the second LED
        delay(1000);                    // Wait for 1 second
        digitalWrite(ledPin2, HIGH);    // Turn on the third LED
        delay(1000);                    // Wait for 1 second
        digitalWrite(ledPin, LOW);      // Turn off the first LED
        delay(1000);                    // Wait for 1 second
        digitalWrite(ledPin1, LOW);     // Turn off the second LED
        delay(1000);                    // Wait for 1 second
        digitalWrite(ledPin2, LOW);     // Turn off the third LED
      }
  } else {                              // If the button is not pressed
    
    digitalWrite(ledPin, LOW);          // Turn off the first LED
    digitalWrite(ledPin1, LOW);         // Turn off the second LED
    digitalWrite(ledPin2, LOW);         // Turn off the third LED
  }
  
}