import java.io.FileNotFoundException;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		long t = System.currentTimeMillis();
		new Main().run();
		System.err.println(System.currentTimeMillis() - t);
	}
	
	long inv(long a) {
		return pow(a,MOD-2);
	}
	
	long pow(long a,long n) {
		long ret=1;
		for(;n>0;n>>=1,a=a*a%MOD)if(n%2==1)ret=ret*a%MOD;
		return ret;
	}
	
	final long MOD=(long)1e9+7;
	
	void run() {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		long ans=1;
		for(long i=1;i<=2*N;++i)ans=ans*i%MOD;
		for(long i=1;i<=N;++i)ans=ans*inv(2)%MOD;
		System.out.println(ans);
	}


	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}