#include<iostream>
using namespace std;
#define m %100000007
unsigned long long C(unsigned long long x){
	if(x==1) return 1;
	if(x==2) return 2;
	return C(x-1)m*(4*x-2)m/(x+1)m;
}
int main(){
	unsigned long long n;
	cin >> n;
	cout << C(n);
	return 0;
} 

#include <iostream>
using namespace std;
unsigned long long Catalan(unsigned long long n){
	if(n <= 1) return 1;
	unsigned long long h[n+1];
	h[0] = h[1] = 1;
	for(unsigned long long i = 2; i <= n; i++){
		h[i] = 0;
		for(unsigned long long j = 0; j < i; j++){
			h[i] += (h[j] * h[i-1-j]) % 100000007;
		}
	}
	return h[n] % 100000007;
}
int main(){
	unsigned long long n;
	cin >> n;
	printf("%d",Catalan(n));
}

都rt了。