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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7.   public static void main (String[] args) throws java.lang.Exception
  8.   {
  9.     int a,n;
  10.     double s=0,q=1;
  11.     Scanner in = new Scanner(System.in);
  12.     n=in.nextInt();
  13.     for(int i=1;i<=n;i++){
  14.       q=q*2;  
  15.       s+=(2*i-1)/q;
  16.     }
  17.     System.out.println(s);
  18.  
  19.   }
  20. }
Success #stdin #stdout 0.12s 29356KB
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https://ideone.com/sFrUzI
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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