int8_t lastSwitch=-1;

SIGNAL(SIG_INTERRUPT0){
        PORTB &=~(1<<PB0);
        if(bit_is_set(PINA,PA0) || lastSwitch==0){
                PORTD ^=(1<<PD5);
                lastSwitch=0;
        }
        else if(bit_is_set(PINA,PA1) || lastSwitch==1){
                PORTD ^=(1<<PD6);
                lastSwitch=1;
        }
        else;
}