using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

namespace AtCoder.D
{
    public class Program
    {
        public static void Main() { var r = GetResult(); Debug.WriteLine(r); Console.Write(r); }

        private static object GetResult()
        {
            //A[N] = A[N-3] + A[N-1]
            var S = ReadLong();
            if (S < 3) { return 0; }

            var A = new Modular[] { 1, 0, 0 };
            var ans = (Modular)0;
            for (var i = 3; i <= S; i++)
            {
                ans = A[0] + A[2];
                A[0] = A[1];
                A[1] = A[2];
                A[2] = ans;
            }
            return ans;
        }

        #region Console.Read

        public static string ReadText() { return Console.ReadLine(); }
        public static List<string> ReadTexts() { return Console.ReadLine().Split(' ').ToList(); }
        public static long ReadLong() { return long.Parse(Console.ReadLine()); }
        public static (long, long) Read2Longs() { var ls = ReadLongs(); return (ls[0], ls[1]); }
        public static (long, long, long) Read3Longs() { var ls = ReadLongs(); return (ls[0], ls[1], ls[2]); }
        public static (long, long, long, long) Read4Longs() { var ls = ReadLongs(); return (ls[0], ls[1], ls[2], ls[3]); }
        public static (long, long, long, long, long) Read5Longs() { var ls = ReadLongs(); return (ls[0], ls[1], ls[2], ls[3], ls[4]); }
        public static List<long> ReadLongs() { return Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToList(); }

        #endregion
    }
    public class Modular
    {
        public long Value { get; private set; }

        private static readonly long _mod = (long)Math.Pow(10, 9) + 7;
        private static readonly List<int> _facCache = new List<int> { 1 };

        public static explicit operator long(Modular m)
        {
            return m.Value;
        }

        public static implicit operator Modular(long a)
        {
            var m = a % _mod;

            return new Modular
            {
                Value = (m < 0) ? m + _mod : m
            };
        }

        public static Modular operator +(Modular a, Modular b)
        {
            return a.Value + b.Value;
        }

        public static Modular operator -(Modular a, Modular b)
        {
            return a.Value - b.Value;
        }

        public static Modular operator *(Modular a, Modular b)
        {
            return a.Value * b.Value;
        }

        public static Modular operator /(Modular a, Modular b)
        {
            return a * Pow(b, _mod - 2);
        }

        public static Modular Pow(Modular a, long n)
        {
            switch (n)
            {
                case 0:
                    return 1;
                case 1:
                    return a;
                default:
                    var p = Pow(a, n / 2);
                    return p * p * Pow(a, n % 2);
            }
        }
        public static Modular Factorial(long n)
        {
            for (var i = _facCache.Count; i <= n; ++i)
            {
                var fac = (int)(Math.BigMul(_facCache.Last(), i) % _mod);
                _facCache.Add(fac);
            }
            return _facCache[(int)n];
        }
        public static Modular Combination(long n, long r)
        {
            Modular ans = 1;
            for (var i = 0; i < r; i++)
            {
                ans *= n - i;
            }
            for (var i = 1; i <= r; i++)
            {
                ans /= i;
            }

            return ans;
        }
        public override string ToString()
        {
            return Value.ToString();
        }
    }
}


Measured memory_bytes: 28188