   echo = 1 (on)
? gettime;sum(x=0,50000,x);
? sum(x=1,1000,log(x));
? sum(x=1,25,sum(y=1,100,x/y),0.0);
? sum(x=1,100,sum(y=1,100,x/y,0.0));
? getheap
[6, 60]
? print("Total time spent: ",gettime);
Total time spent: 16
