#include <unordered_map>
#include <cstdio>
using namespace std;

namespace std{
	template<typename T>
	inline void hash_combine(size_t& seed, T const& v){
		seed ^= hash<T>()(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
	}
	template<typename It>
	inline size_t hash_range(It first, It last){
		size_t seed=0;
		hash_range(seed,first,last);
		return seed;
	}
	template<typename It>
	inline void hash_range(size_t& seed, It first, It last){
		for(;first!=last;++first)hash_combine(seed, *first);
	}
	template<typename A,typename B>
	class hash<pair<A,B>>{
		public:
		size_t operator()(pair<A,B> const &p) const{
			size_t seed=0;
			hash_combine(seed,p.first);
			hash_combine(seed,p.second);
			return seed;
		}
	};
}

unordered_map<pair<pair<int,int>,int>,int>memo;
int dfs(int k,int p,int d){
	if(k<0||p<0)return 0;
	if(d==0)return 1;
	auto x=make_pair(make_pair(k,p),d);
	if(memo.find(x)==memo.end()){
		memo[x]=(dfs(k-1,1,d-1)+dfs(2,p-1,d-1))%1000000007;
	}
	return memo[x];
}
int main(){
	int n;
	scanf("%d",&n);
	printf("%d\n",dfs(2,0,n));
}