#define BUZZER 0
#define B1 1
#define B2 2
#define B3 3
#define B4 4
void setup() {
  pinMode(BUZZER, OUTPUT);
  pinMode(B1, INPUT_PULLUP);
  pinMode(B2, INPUT_PULLUP);
  pinMode(B3, INPUT_PULLUP);
  pinMode(B4, INPUT_PULLUP);
}

void loop() {
  int EB1=digitalRead(B1);
  if (EB1==0){
    tone(BUZZER,220);
    delay(50);
  }else {
    tone(BUZZER,0);
  }


  int EB2=digitalRead(B2);
  if (EB2==0){
    tone(BUZZER,160);
    delay(50);
  }else {
    tone(BUZZER,0);
  }


  int EB3=digitalRead(B3);
  if (EB3==0){
    tone(BUZZER,250);
    delay(50);
  }else {
    tone(BUZZER,0);
  }


  int EB4=digitalRead(B4);
  if (EB4==0){
    tone(BUZZER,175);
    delay(50);
  }else {
    tone(BUZZER,0);
  }
}