using System;

class Program {
    static void Main(string[] args) {
        //入力
        ulong N = ulong.Parse(Console.ReadLine());
        //出力
        switch (N) {
            case 1:
                Console.WriteLine("1");
                break;
            case 2:
                Console.WriteLine("2");
                break;
            case 3:
                Console.WriteLine("2");
                break;
            default:
                //各係数に対する配列を用意する
                ulong[] an = new ulong[N];
                ulong[] bn = new ulong[N];
                ulong[] cn = new ulong[N];
                an[0] = 1;
                an[1] = 0;
                an[2] = 0;

                bn[0] = 0;
                bn[1] = 1;
                bn[2] = 0;

                cn[0] = 0;
                cn[1] = 0;
                cn[2] = 1;

                for (ulong i = 3; i < N; i++) {
                    an[i] = an[i - 3] + an[i - 2];
                    bn[i] = bn[i - 3] + bn[i - 2];
                    cn[i] = cn[i - 3] + cn[i - 2];
                    //an[i] %= (uint)Math.Pow(10, 9) + 7;
                    //bn[i] %= (uint)Math.Pow(10, 9) + 7;
                    //cn[i] %= (uint)Math.Pow(10, 9) + 7;
                }
                Console.WriteLine((an[N - 1] + 2 * bn[N - 1] + 2 * cn[N - 1]) % (uint)(Math.Pow(10, 9) + 7));
                break;
        }
    }
}