ZZULIOJ 1040: 数列求和1，Java

1040: 数列求和1

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
    Scanner cin = new Scanner(System.in);int n;double sum=0;n=cin.nextInt();for(int i=1;i<=n;i++) sum+=1.0/(2*i-1);System.out.printf("%.2f",sum);}
}