/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;


class SpecialSeries {
	
    public static double m(int n){
        double sum = 0;
        for (int i = 1; i <= n; i++) {
            sum += Math.pow(-1, (i+1))/(double)i;
        }  
        System.out.println(n+"\t"+sum);
        return sum;
    }  
    
    public static void main(String[] args) {
        System.out.println("i:\tm(i)");
        for (int i = 5; i < 50; i+=5) {
            m(i);
        }
    }
}