program b2;
uses crt;

begin
   port(.888.):=1; 
   delay(2000);
   port(.888.):=2; 
   delay(2000);
   port(.888.):=4; 
   delay(2000);
   port(.888.):=8; 
   delay(2000);
   port(.888.):=16; 
   delay(2000);
   port(.888.):=32; 
   delay(2000);
   port(.888.):=64; 
   delay(2000);
   port(.888.):=128; 
   delay(2000);
   port(.888.):=0; 
end.