void setup() {
 DDRB=0b00111000;
 DDRD=0b00000000;
 PORTD=0b00110000;
 PCICR=0b00000100;
 PCMSK2=0b00110000;
}

void loop() {
bitWrite(PORTB,4,1);
delay(100);
bitWrite(PORTB,4,0);
delay(100);
}
ISR (PCINT2_vect)
{ 
  if(bitRead(PIND,4)==0){
  bitWrite(PORTB,3,1);
}
  else if(!bitRead(PIND,4)==0){
  bitWrite(PORTB,3,0);
}
 if(bitRead(PIND,5)==0){
  bitWrite(PORTB,5,1);
 }
 else if(!bitRead(PIND,5)==0){
  bitWrite(PORTB,5,0);
 }
}