#include <reg51.h>
unsigned int a,res;
unsigned long s;
char i;
main()
{
	a=P0<<8;
	s=P1;        //b - in P2
  	for (i=0;i<8;i+=1)
  	{
	 if ((s&0x0001)==1) s+=a;
	 s=s>>1;
  	}
	res=s&0x0000ffff;
	P3=res;
	P2=res>>8;
	while(1);
}