RCC Elim D

import java.io.*;
import java.util.*;

public class saw_bm {
    FastScanner in;
    PrintWriter out;

    void solve() {
        int n = in.nextInt();
        final int MOD = (int) 1e9 + 7;
        int[] dp1 = new int[n + 1];
        dp1[n] = 1;
        int[] dp2 = new int[n + 1];
        for (int i = 0; i < n; i++) {
            Arrays.fill(dp2, 0);
            int total = n - i;
            if (i % 2 == 0) {
                int numberOfWays = 0;
                for (int cur = total - 1; cur >= 0; cur--) {
                    numberOfWays += dp1[cur + 1];
                    if (numberOfWays >= MOD)
                        numberOfWays -= MOD;
                    dp2[cur] += numberOfWays;
                    if (dp2[cur] >= MOD)
                        dp2[cur] -= MOD;
                }
            } else {
                int numberOfWays = 0;
                for (int cur = 0; cur< total; cur++) {
                    numberOfWays += dp1[cur];
                    if (numberOfWays >= MOD)
                        numberOfWays -= MOD;
                    dp2[cur] += numberOfWays;
                    if (dp2[cur] >= MOD)
                        dp2[cur] -= MOD;
                }
            }
            int[] tmp = dp1;
            dp1 = dp2;
            dp2 = tmp;
        }
        long res = 0;
        for (int i = 0; i <= n; i++) {
            res += dp1[i];
        }
        out.println(res % MOD);
    }

    void run() {
        try {
            in = new FastScanner(new File("saw.in"));
            out = new PrintWriter(new File("saw.out"));

            solve();

            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    void runIO() {

        in = new FastScanner(System.in);
        out = new PrintWriter(System.out);

        solve();

        out.close();
    }

    class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        public FastScanner(File f) {
            try {
                br = new BufferedReader(new FileReader(f));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        public FastScanner(InputStream f) {
            br = new BufferedReader(new InputStreamReader(f));
        }

        String next() {
            while (st == null || !st.hasMoreTokens()) {
                String s = null;
                try {
                    s = br.readLine();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (s == null)
                    return null;
                st = new StringTokenizer(s);
            }
            return st.nextToken();
        }

        boolean hasMoreTokens() {
            while (st == null || !st.hasMoreTokens()) {
                String s = null;
                try {
                    s = br.readLine();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (s == null)
                    return false;
                st = new StringTokenizer(s);
            }
            return true;
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }
    }

    public static void main(String[] args) {
        new saw_bm().runIO();
    }
}