int mynum;
int buzzpin=8;
String msg="please enter a number";
int dt=500;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(buzzpin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
Serial.println(msg);
while (Serial.available()==0) {

}

mynum=Serial.parseInt();
if (mynum>10) {
digitalWrite(buzzpin, HIGH);
delay(dt);
digitalWrite(buzzpin, LOW);
}
}