package contest170623;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class F {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		// a[n-1]-(n-1) < a[n]
		// a[3]-3 < a[4] tight
		// a[3] < a[4]+4
		// a[n]-n < a[1]
		// a[n] < a[1] + 1
		int n = ni();
		int mod = 1000000007;
		long ans = 0;
		{
			// a[n-1]-(n-1) < a[n] < a[1] + 1
			// a[n-1] < a[n] + n
			// a[n-1] - (n-1) < a[n]
			
			// a[n] - 1 < a[1]
			// a[i-1] - (i-1) < a[i]
			// a[i-1] < a[i] + i
			
			long[][] dp = new long[n][n+1];
			// 0:n
			// 1:1
			for(int i = 1;i <= n;i++){
				dp[0][i] = 1;
			}
			for(int i = 1;i < n;i++){
				// a[i-1]-t < a[i]
				int p = 1;
				long s = 0;
				for(int j = 1;j <= n;j++){
					int t = i == 1 ? 1 : i-1;
					while(p <= n && p-t < j){
						s += dp[i-1][p];
						if(s >= mod)s -= mod;
						p++;
					}
					dp[i][j] = s;
				}
			}
			for(int j = 1;j <= n;j++){
				ans += dp[n-1][j];
			}
		}
		{
			long[][] dp = new long[n][n+1];
			// 0:n
			// 1:1
			dp[0][1] = 1;
			for(int i = 1;i < n;i++){
				// a[i-1]-t < a[i]
				int p = 1;
				long s = 0;
				for(int j = 1;j <= n;j++){
					int t = i == 1 ? 1 : i-1;
					while(p <= n && p-t < j){
						s += dp[i-1][p];
						if(s >= mod)s -= mod;
						p++;
					}
					dp[i][j] = s;
				}
			}
			ans -= dp[n-1][n];
		}
		ans += mod;
		out.println(ans%mod);
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new F().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}