/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone {
	public static void main(String[] args) {
		//In this first call, no terms are used since none are greater
		//than EPSILON which is 2.
		System.out.printf("%.10f\n", addInverses(2)) ;
		System.out.println("0.0000000000 is expected.") ;
		System.out.println("------------") ;
 
		//In this second call, no terms are used since none are greater
		//than EPSILON which is 1.
		System.out.printf("%.10f\n", addInverses(1)) ;
		System.out.println("0.0000000000 is expected.") ;
		System.out.println("------------") ;
 
		//In this third call, one term is used since only the first one (1)
		//is greater than EPSILON which is 0.5
		System.out.printf("%.10f\n", addInverses(0.5)) ;
		System.out.println("1.0000000000 is expected.") ;
		System.out.println("------------") ;
 
		System.out.printf("%.10f\n", addInverses(0.3)) ;
		System.out.printf("%.10f is expected.\n", 1 + 0.5 + 1/3.0) ;
		System.out.println("------------") ;
 
		System.out.printf("%.10f\n", addInverses(1E-4)) ;
		System.out.println("9.7875060360 is expected.") ;
		System.out.println("------------") ;
 
		System.out.printf("%.10f\n", addInverses(1E-5)) ;
		System.out.println("------------") ;
    }
 
    /**
       Adds up 1 + 1/2 + 1/3 + ... + 1/n,
       where 1/n is the last term in the sequence greater than a 
       given constant called EPSILON.  
       That is, we only use terms which are greater than EPSILON.
 
       For example, if EPSILON is 0.3, then return 1 + 1/2 + 1/3
       and if EPSILON is 0.5, then return 1  (since 1/2 is not greater than 0.5)
       @param EPSILON a small threshold, above which we keep adding 1/n,
          for n = 1, 2, 3, ... 
     */
    //-----------Start below here. To do: approximate lines of code = 12
    // 1. write the static method
    public static double addInverses(double EPSILON) {
		double returnVal = 0,
    		   nextTerm = 0;
 
  		int counter = 1;
 
    	while ((nextTerm = (1.0 / counter++ )) > EPSILON)
			returnVal += nextTerm;
 
		return returnVal; 
    }
    //-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.
}

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