void setup() {
  // put your setup code here, to run once:
  DDRD |= (1 << PD7);
  cli();
  TCCR2A = 0;
  TCCR2B = 0;
  TCCR2B |= (1 << CS22) + (1 << CS21) + (1 << CS20);
  TIMSK2 |= (1 << TOIE1);
  sei();
}

/*ISR(TIMER2_OVF_vect) {
  PORTD ^= (1<<PD7);
}*/

//f=flck/(N*TCNT) = 16000000/(1024*254)

ISR(TIMER2_OVF_vect){
  static int stevec = 0;
  stevec++;
  if (stevec >= 60){
    stevec = 0;
    PORTD ^= (1<<PD7);
  }
}

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

}