/*
    Java might be good for Competitive Programming but Python still rocks!!!!!!!!!


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   pppppppppppppppppppppppppppppppppppppppppppppp     pppppppppppppppppppppppppp
  ppppppppppppppppppppppppppppppppppppppppppppp      pppppppppppppppppppppppppppp
  pppppppppppppppppppppppppppppppp               pppppppppppppppppppppppppppppppp
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      pppppppppppppppppppppp  ppppppppppppppppppppppppppppppppppppppppppppppp
       ppppppppppppppppppppp  ppppppppppppppppppppppppppppppppppppppppppppp
                              pppppppppppppppppppppppp
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                              pppppppppppppppppppppp  pppppppp
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*/


import java.util.*;
import java.lang.*;
import java.io.*;
class Main
{
    public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
    public static int t, n, i, j, k, u, v, s, mod = (int)1e9+7;
    public static void main(String[] args) throws IOException
    {
        FastScanner sc = new FastScanner();
        Print print = new Print();
        int[] arr = new int[1999];
        for(i = 0; i <= 1998; i++)
            arr[i] = i + 3;
        int N = sc.nextInt();
        int[] count = new int[N + 1];
        count[0] = 1;
        for (int i = 1; i <= N; i++)
            for (int j = 0; j < arr.length; j++)
                if (i >= arr[j])
                    count[i] = (count[i] + count[i - arr[j]]) % mod;
        out.write(count[N]+"");
        out.flush();
        out.close();
    }
    public static class Print
    {
        Print()
        {}

        void integer(int... arr) throws IOException
        {
            for(int value: arr)
            {
                out.write(value+" ");
                out.flush();
            }
            out.write("\n");
            out.flush();
        }

        void string(String... arr) throws IOException
        {
            for(String value: arr)
            {
                out.write(value+" ");
                out.flush();
            }
            out.write("\n");
            out.flush();
        }

        void character(char... arr) throws IOException
        {
            for(char value: arr)
            {
                out.write(value+" ");
                out.flush();
            }
            out.write("\n");
            out.flush();
        }

        void long_int(long... arr) throws IOException
        {
            for(long value: arr)
            {
                out.write(value+" ");
                out.flush();
            }
            out.write("\n");
            out.flush();
        }
    }

    static class FastScanner
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st=new StringTokenizer("");
        String next()
        {
            while (!st.hasMoreTokens())
                try
                {
                    st=new StringTokenizer(br.readLine());
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
            return st.nextToken();
        }

        int nextInt()
        {
            return Integer.parseInt(next());
        }
        int[] readArray(int n)
        {
            int[] a=new int[n];
            for (int i=0; i<n; i++) a[i]=nextInt();
            return a;
        }
        long nextLong()
        {
            return Long.parseLong(next());
        }
    }
}


Measured memory_bytes: 25972