import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.lang.*;
public class godmos11{
private Double delet(StringBuffer r2){
           String r=r2.toString();


           String[] words = r.split("/",2);
           Pattern   p ,p1;
           Matcher   m ,m1;
           p = Pattern.compile("\\d+\\.\\d+$");
           m = p.matcher(words[0]);
           p1 = Pattern.compile("^\\d+\\.\\d+");
           m1 = p1.matcher(words[1]);

           while (m.find() && m1.find() ){
           String y1=m.group();
           String y2=m1.group();
           double tmp1 = Double.parseDouble(y1);
		   double tmp2 = Double.parseDouble(y2);
		   return tmp1/tmp2;
           }

	return null ;
}