Here only one number is needed to print. So I use pre-calculation. The code that I use for pre-calculation is as follows.

main(void)
{            unsigned long int pos=11,_num=15,num,i=1;
            while(pos<1500)
      {      _num++;
            num=_num;
            while(!(num%5))      num /=5; while(!(num%3))  

num /=3;

while(!(num&1))     

num >>=1;
if(num==1)
{      pos++;

                  if((i*100)<pos)        

i++;

                  gotoxy(20,0+i);  

cout<< pos<< " th ugly num is  " << _num;

      }      }

      cout << "The 1500'th ugly number is "<<_num;

      getch();   

return 0;

}

The number is 859963392

Don�t cheat with yourself.