int i = 0;
void setup() {
  // put your setup code here, to run once:
pinMode(8, OUTPUT);
pinMode(10, OUTPUT);
pinMode(13, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(13)==1){
  i = i + 1;
  digitalWrite(8, HIGH);
  delay(100);
  digitalWrite(8, LOW);
  if(i%2 == 1){
    tone(10,1000);
    }
else{
  noTone(10);
}
}
}