/* 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);
        }
    }
}

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