var x1 : double = 0; 
var x2 : double = 0;
var x3 : double = 0;
var start: Date;
var end: Date;

//var x1, x2, x3=0;
 start = new Date();
 for (x1=1; x1<=10000; x1++)
   for(x2=1; x2<=10000; x2++) 
    x3 += Math.sqrt(x1*x2) ; 
 end = new Date();

print("Time for loop: " + (end.getTime()-start.getTime())*1.0/1000) ;