long　i;
　long　a,b,c;
　long　t1,t2;
　t1 = System.currentTimeMillis();
　for(i=0;i<10000000;i++){
　　a=i;b=i*2;c=i/3+1;
　　a= a*b/c;
　}
　t2 = System.currentTimeMillis();
　System.out.println("time = "+(t2-t1) +"msec.");

8620msec