const int RED_LED    = 15;
const int YELLOW_LED = 14;
const int GREEN_LED  = 13;
const int BUTTON_PIN = 16;
const int BUZZER_PIN = 12;

void setup() {
  pinMode(RED_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);  
  pinMode(BUZZER_PIN, OUTPUT);


  digitalWrite(RED_LED, LOW);
  digitalWrite(YELLOW_LED, LOW);
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(BUZZER_PIN, LOW);
}

void beep(int duration) {
  digitalWrite(BUZZER_PIN, HIGH);
  delay(duration);
  digitalWrite(BUZZER_PIN, LOW);
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW) {
    digitalWrite(GREEN_LED, HIGH);
    delay(3000);

   
    for (int i = 0; i < 4; i++) {
      digitalWrite(GREEN_LED, LOW);
      delay(250);
      digitalWrite(GREEN_LED, HIGH);
      delay(250);
    }
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(YELLOW_LED, HIGH);
    delay(1500);
    digitalWrite(YELLOW_LED, LOW);

    
    digitalWrite(RED_LED, HIGH);
    for (int i = 0; i < 5; i++) {
      beep(200);
      delay(300);
    }
    delay(2000);
    digitalWrite(RED_LED, LOW);
  }
}