void setup() {
  // put your setup code here, to run once:\
  pinMode(A0, OUTPUT);
  for(int i = 2; i <= 8; i++){
    pinMode(i, INPUT_PULLUP);
  }

}

void loop() {
  // put your main code here, to run repeatedly:

  int x2 = digitalRead(2);
  int x3 = digitalRead(3);
  int x4 = digitalRead(4);
  int x5 = digitalRead(5);
  int x6 = digitalRead(6);
  int x7 = digitalRead(7);
  int x8 = digitalRead(8);

  if(x2 == LOW){
    tone(A0,240, 150);
  }
  if(x3 == LOW){
    tone(A0,270, 150);
  }
  if(x4 == LOW){
    tone(A0,300, 150);
  }
  if(x5 == LOW){
    tone(A0,320, 150);
  }
  if(x6 == LOW){
    tone(A0,360, 150);
  }
  if(x7 == LOW){
    tone(A0,400, 150);
  }
  if(x8 == LOW){
    tone(A0,450, 150);
  }

}