#define SWITCH_PIN 2
#define LED_PIN 3
#define LED_PIN1 4
#define LED_PIN2 5

void setup() {
  pinMode(SWITCH_PIN, INPUT_PULLUP); // assuming switch to ground
  pinMode(LED_PIN, OUTPUT);
  pinMode(LED_PIN1, OUTPUT);
  pinMode(LED_PIN2, OUTPUT);
}

void loop() {
  if (digitalRead(SWITCH_PIN) == LOW) { 
    digitalWrite(LED_PIN, HIGH);
    delay(2000);
    digitalWrite(LED_PIN, LOW);
    delay(2000);

    digitalWrite(LED_PIN1, HIGH);
    delay(2000);
    digitalWrite(LED_PIN1, LOW);
    delay(2000);

    digitalWrite(LED_PIN2, HIGH);
    delay(2000);
    digitalWrite(LED_PIN2, LOW);
    delay(2000);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(LED_PIN1, LOW);
    digitalWrite(LED_PIN2, LOW);
  }
}