#include<reg52.h>
void delay()
{
	int i,j;
	for(i=0;i<=400;i++)
		for(j=0;j<=380;j++);
 }
 void main()
 {
 	int lowno=0,highno;
	int i=0,m=0;
	int time[3]={3,1,2},led[3]={0xFB,0xFE,0xFD};
	highno=time[0];
	while(1)
	{
		P2=lowno;
		P0=highno;
		P1=led[i];
		lowno--;
		if(highno==0&&lowno==0) 
		{
			m++;
			i=m%3;
			highno=time[i];
			if(m==243) m=0;
		 }
		if(lowno==-1)
		{
			lowno=9;
			highno--;
		 }
		 
		delay();
	 }
 }