delay(int t)
{int i,j;
for(i=0;i<t;i++);
for(j=0;j<10;j++);
}

main()
{
while(1)
{
P1^0=!P1^0;
P1^1=!P1^1;
P1^2=!P1^2;
delay(10);
}
}