Problem:
Score : 100 points

Problem Statement

Given is an integer N.

Takahashi chooses an integer a from the positive integers not greater than N with equal probability.

Find the probability that a is odd.

Constraints

1 \leq N \leq 100

Input

Input is given from Standard Input in the following format:

N

Output

Print the probability that a is odd.
Your output will be considered correct when its absolute or relative error from the judge's output is at most 10^{-6}.

Sample Input 1

4

Sample Output 1

0.5000000000

There are four positive integers not greater than 4: 1, 2, 3, and 4. Among them, we have two odd numbers: 1 and 3. Thus, the answer is \frac{2}{4} = 0.5.

Sample Input 2

5

Sample Output 2

0.6000000000

Sample Input 3

1

Sample Output 3

1.0000000000

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        var N = int.Parse(Console.ReadLine());
        var count = 0;
        for(var i = 1; i<=N; i++)
        {
            double temp = i % 2;
            if(temp != 0)
            {
                count++;
            }
        }
        Console.WriteLine(1.0 * count / N);
    }


    public string[] ReadInput()
    {
        return Console.ReadLine().Split(' ');
    }

    public int[] ConvertIntArray(string[] x)
    {
        var convertedArray = new int[x.Length];
        for (var i = 0; i < x.Length; i++)
        {
            convertedArray[i] = int.Parse(x[i]);
        }

        return convertedArray;
    }

}