using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var dp = new long[n + 1];
        dp[0] = 1;
        var mod = 1_000_000_007;
        for (var i = 3; i <= n; ++i)
        {
            for (var j = 0; j + i <= n; ++j) dp[i + j] = (dp[i + j] + dp[j]) % mod;
        }
        WriteLine(dp[n]);
    }
}