if(PIND &0b00010000)
        {
        platz=16;
        PORTB = ledaus;
        }
        else{
        if(platz>0){
        PORTB|=(1<<0);
        PORTB &= 0x01;
                }
                else{
                PORTB |= (1<<1);
                PORTB &= 0x02;
                }}
  
        }while(1);
 
}