void setup() {
DDRD |= (1 << PD7);
cli();
  TCCR2A = 0;
  TCCR2B = 0;
  TCCR2B |= (1 << CS22) + (1 << CS22) + (1 << CS20);
  TIMSK2 |= (1 << TOIE1);
  TCNT2 = 131;
sei();
Serial.begin(115200);
}

ISR(TIMER2_OVF_vect){
  static unsigned long stevec = 0;
  PORTD ^= (1 << PD7);
  stevec++;
  Serial.println(stevec);

}

void loop() {
  // put your main code here, to run repeatedly:

}