#define BUZZER 0
#define PUSH 1
#define PUSH1 2
#define PUSH2 3
#define PUSH3 4
 

void setup() {

pinMode(BUZZER, OUTPUT);
pinMode(PUSH, INPUT);
pinMode(PUSH1, INPUT);
pinMode(PUSH2, INPUT);
pinMode(PUSH3, INPUT);
}

void loop() {
  if (digitalRead(PUSH)==0){
    tone(BUZZER, 200);
    delay(100);
  }
if (digitalRead(PUSH1)==0){
  tone(BUZZER, 150);
    delay(100);
}
if (digitalRead(PUSH2)==0){
  tone(BUZZER, 200);
    delay(100);
}
if (digitalRead(PUSH3)==0){
  tone(BUZZER, 150);
    delay(100);
}else{ 
  tone(BUZZER, 0);
}
  delay(1); // this speeds up the simulation
}