#include <stdio.h>
#define MOD 1000000007


typedef unsigned long long flandre;

flandre binpow(flandre a, flandre p){
	flandre powing = a;
	flandre result = 1;
	while (p) {
		if (p & 1) {
			result *= powing;
			result %= MOD;
		}
		p = p >> 1;
		powing = (powing * powing) % MOD;
	}
	return result;
}

long solve(int n){
	flandre numerator, denominator;
	int i;

	numerator = denominator = 1;
	for (i = n + 1; i <= 2 * n; i++) {
		numerator *= (flandre)i;
		numerator %= MOD;
	}
	for (i = 1; i <= n + 1; i++) {
		denominator *= (flandre)i;
		denominator %= MOD;
	}
	return (long)((numerator * binpow(denominator, MOD - 2)) % MOD);
}

int main(void){
	int n;
	scanf("%d", &n);
	printf("%ld\n", solve(n));
	return 0;
}