using System;

public class Program

{

    public static void Main()

    {

        Console.Write("n= ");

        int n=int.Parse (Console.ReadLine());

        int sum= 0;

        for (int i= 1;i<=n; i+=2)

        {

          if (1%7==0)

          {

             continue;

          }

          sum+=i;

​

        }

        Console.WriteLine("sum= "+sum);

        Console.ReadLine();

    }

}