int buzzer = 4;
int sw1 = 11;
int sw2 = 10;
int sw3 = 9;
int sw4 = 8;
void setup()
{
  pinMode(buzzer, OUTPUT);
  pinMode(sw1, INPUT_PULLUP);
  pinMode(sw2, INPUT_PULLUP);
  pinMode(sw3, INPUT_PULLUP);
  pinMode(sw4, INPUT_PULLUP);
}
void beep(int times) {
  for (int i = 0; i < times; i++){
  tone(buzzer,1500);
  delay(200);
  noTone(buzzer);
  delay(200);
    }
     }
void loop(){ 
  if (digitalRead(sw1) == LOW) {
    beep(1);
  }else if (digitalRead(sw2) == LOW) {
    beep(2);
  }else if (digitalRead(sw3) == LOW) {
  beep(3);
  }else if (digitalRead(sw4) == LOW) {
    beep(4);
  }
}