//c++ code
//
void setup()
{
  pinMode(LED_BUILTIN, OUTPUT);
}
void loop()
{
  tone(8200,1000);
  delay(1000);
  tone(8400,1000);
  delay(1000);
  tone(8800,1000);
  delay(1000);
  tone(8120,1000);
  delay(1000);
}