import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;

public class Main {
	static FastScanner sc = new FastScanner();
	static final long MOD = 1000000007;

	public static void main(String[] args) {
		long N = sc.nextLong();
		
		System.out.println(factorial(2 * N) * power(power(2, N), MOD - 2) % MOD);
	}
	
	static long factorial(long N) {
		long ans = 1;
		for(int i=2; i<=N; i++) {
			ans = ans * i % MOD;
		}
		return ans;
	}
	
	static long power(long k, long N) {
		if(N == 1) {
			return k;
		} else if(N%2 == 0) {
			long a = power(k, N/2);
			return a * a % MOD;
		} else {
			return k * power(k, N-1) % MOD;
		}
	}

	static class FastScanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;
        private boolean hasNextByte() {
            if(ptr < buflen) {
                return true;
            } else {
                ptr = 0;
                try {
                    buflen = in.read(buffer);
                } catch(IOException e) {
                    e.printStackTrace();
                }
                if(buflen <= 0) {
                    return false;
                }
            }
            return true;
        }
        private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
        private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
        private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
        public boolean hasNext() { skipUnprintable(); return hasNextByte();}
        public String next() {
            if (!hasNext()) throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while(isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }
        public long nextLong() {
            return Long.parseLong(next());
        }
        public int nextInt(){
            return Integer.parseInt(next());
        }
        public double nextDouble(){
            return Double.parseDouble(next());
        }
    }
}