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

unordered_map<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=(d<<3)|(k<<1)|p;
	if(memo.find(x)!=memo.end())return memo[x];
	return memo[x]=(dfs(k-1,1,d-1)+dfs(2,p-1,d-1))%1000000007;
}
int main(){
	int n;
	scanf("%d",&n);
	printf("%d\n",dfs(2,0,n));
}