public class ModifyXMLFile {
    public static void factoFerma(long f){
       double s = Math.sqrt(f);
       long x = (long)s + 1;
       long y = 0;
       long a = 0;
       long b = 0;
       while(true){
           long w = x*x-f;
           if ((Math.sqrt(w)%1==0)){
            y = (long)Math.sqrt(w);
            a = x + y;
            b = x - y;}
           else {x = x+1;}
           long r = w - y*y;
           if (r==0){
               break;
           }
        }

       System.out.println("[" + a + "*" + b + "]");