using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
            string[] m_temp = Console.ReadLine().Split(' ');
            int[] m = Array.ConvertAll(m_temp, Int32.Parse);
            if(n%2==0)
            {
                Console.WriteLine((n - 1) % 1000000007);
            }
            else
                Console.WriteLine((n+1) % 1000000007);
            Console.ReadLine();
    }
}