Trivia Game

int btn;
int btn2;
int buzzed_in = 0;
int d4 = 294;
int e4 = 330;
int c4 = 262;

void setup() {
  // put your setup code here, to run once:
  pinMode(7, INPUT);
  pinMode(8, INPUT);
  pinMode(4, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(3,OUTPUT);
  digitalWrite(4, LOW);
  digitalWrite(6, LOW);
}

void loop() {
  if(buzzed_in == 0)
  {
  // put your main code here, to run repeatedly:
  btn = digitalRead(7);
  btn2 = digitalRead(8);
  if(btn == LOW)
  {
    digitalWrite(4, HIGH);
     tone(3, d4);
     buzzed_in = 1;
  delay(500);
  noTone(3);
  delay(50);
  }