DDRB|=(1<<PB0)|(1<<PB1)|(1<<PB2);
  DDRD=0x00;
  PORTD|=(1<<PD2)|(1<<PD3);
  
  
  
  
  while(1)
  {
   
     
  
     
     if( ! (PIND & (1<<PD2 | 1<<PD3)) )
     {
     
        PORTB|=(1<<PB0)|(1<<PB1)|(1<<PB2);   
     
     }
     
     
     else if(!(PIND & (1<<PD2)  ) )
     {
     
     
       PORTB|=(1<<PB0);
       PORTB&=~( (1<<PB1)|(1<<PB2) );
      
      
     }
     
     else if( ! (PIND & (1<<PD3) ))
     {
     
       PORTB|=(1<<PB0)|(1<<PB1);
       PORTB&=~(1<<PB2);
       
     
     }
     
     
      else
      {
      
         PORTB&=~(  (1<<PB0)|(1<<PB1)|(1<<PB2));
      
      
      }