#include<cstdio>


#define MOD 1000000007

using ll=long long;


ll mod_pow(ll a, ll b)
{
	ll c, ret=1;

	for(c=a;b;b>>=1)
	{
		if(b&1) ret=(ret*c)%MOD;
		c=(c*c)%MOD;
	}
	return ret;
}


ll mod_inv(ll a)
{
	return mod_pow(a, MOD-2);
}



int main(void)
{
	int n;
	ll ans, ans_;

	while(scanf("%d", &n)==1)
	{
		ll ans=1;
		ll ans_=1;

		for(int i=1;i<=n*2;i++)
		{
			ans=(ans*i)%MOD;
		}
		for(int i=1;i<=n;i++)
		{
			ans_=(ans_*2)%MOD;
		}
		printf("%lld\n", (ans*mod_inv(ans_))%MOD);
	}

	return 0;
}