void setup() {
  
  Serial.begin(9600);
  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
}

void loop() {
  
  digitalWrite(3, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  tone(9, 200, 1000);

  delay(1000);

  digitalWrite(5, HIGH);
  tone(9, 300, 1000);

  delay(1000);
  
  digitalWrite(6, HIGH);
  tone(9, 400, 1000);

  delay(1000);

  digitalWrite(3, LOW);
  tone(9, 300, 1000);

  delay(1000);

  digitalWrite(5, LOW);
  tone(9, 200, 1000);

  delay(1000);

  digitalWrite(6, LOW);
  tone(9, 200, 500);

  delay(500);

  digitalWrite(3, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  tone(9, 500, 1000);

  delay(1000);

  digitalWrite(3, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  tone(9, 200, 500);

  delay(1000);

  digitalWrite(3, HIGH);
  digitalWrite(6, HIGH);
  tone(9, 300, 500);

  delay(1000);

  digitalWrite(3, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, LOW);
  tone(9, 350, 500);

  delay(1000);

  digitalWrite(3, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);
  tone(9, 300, 500);

  delay(1000);

  digitalWrite(3, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, LOW);
  tone(9, 350, 500);

  delay(1000);
}