int count;
#define I 7

void setup() {
Serial.begin(9600);
DDRD &= ~(1<<5);
PORTD |= (1<<5);
DDRB &= ~(1<<0);
PORTB |= (1<<0);
PORTC |= (1<<5);
DDRC &= ~(1<<5);



EICRA |= 1<<ISC11;
EICRA &= ~(1<<ISC10);
EIMSK |= 1<<INT1;
SREG |= 1<<7;

SREG |= 1<<I;
PCICR |= 1<<PCIE2;
PCICR |= 1<<PCIE1;
PCICR |= 1<<PCIE0;
PCMSK2 |= 1<<PCINT21;
PCMSK1 |= 1<<PCINT13;
PCMSK0 |= 1<<PCINT0;
}

void loop() {

}

ISR(PCINT2_vect)
{
  

  if((PIND&(1<<5)) == 0)
  {
    count--;
    
    Serial.print(count);
  }
}

ISR(PCINT1_vect)
{
  if((PINB&(1<<0)) == 0)
  {
   count = 0;
 
    
    Serial.print(count);
  }
}

ISR(PCINT0_vect)
{
  count++;
  Serial.print(count);
}