int LED=13;
int BUZZER=4;
int BUTTON=2;


void setup() {
  pinMode(LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(BUTTON, INPUT);
}

void loop() {
if (digitalRead(BUTTON)==HIGH){
  digitalWrite(LED, HIGH);
  digitalWrite(BUZZER, LOW);
  delay(500);
  
  digitalWrite(LED, LOW);
  digitalWrite(BUZZER, HIGH);
  delay(500);
}

}