{

    read_char();//read number
    d1=d0;
    read_char();
    d2=d0;
    read_char();
    d3=d0;

    //computation

    d4=0;
    d4=d4+d1;
    d4=d4+d2;
    d4=d4+d3;//d4 is now x

    d5=0;
    d5=1000;//d5 is now the numerator of the fraction (1000)

    d4=1+d4;//d4 is now the denominator of the fraction (1+x)

    d5=d5/d4;//d5 is now the quotient of d5/d4, and the whole inside of the brackets of our equation

    d5=d5-1;//the last arithmetic operation, d5 is now our result (y)

    //make d1,d2,d3 = digits of d5, d5 represented in binary.
    d1=d5%10;
    d5=d5/10;
    d2=d5%10;
    d5=d5/10;
    d3=d5%10;


    d0=13;
    write_char();//carriage return
    d0=10;
    write_char();//line feed
    d0=d3;
    write_char();//write y
    d0=d2;
    write_char();
    d0=d1;
    write_char();



  return 0;         // exit
}