#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

#define CIN_ONLY if(1)
struct cww{cww(){
    CIN_ONLY{
        ios::sync_with_stdio(false);cin.tie(0);
    }
}}star;
#define fin "\n"
#define FOR(i,bg,ed) for(int i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
#define pb push_back
#define DEBUG if(0)
#define REC(ret, ...) std::function<ret (__VA_ARGS__)>
template <typename T>inline bool chmin(T &l,T r)
{bool a=l>r;if(a)l=r;return a;}
template <typename T>inline bool chmax(T &l,T r)
{bool a=l<r;if(a)l=r;return a;}
template <typename T>
istream& operator>>(istream &is,vector<T> &v){
    for(auto &it:v)is>>it;
    return is;
}

const int mod=1e9+7;
vector<LL> count(LL N,vector<LL> ini){
    auto dp=ini;
    REP(i,N-1){
        REP(j,N-1)(dp[j+1]+=dp[j])%=mod;
        vector<LL> nxt(N,0);
        LL sa=max(i-1,0);
        REP(j,N){
            (nxt[j]+=dp[min(N-1,j+sa)])%=mod;
        }
        swap(dp,nxt);
    }
    return dp;
}
int main(){
    int N;
    cin>>N;
    vector<LL> S(N,0);
    S[0]=1;
    auto A = count(N,S);
    fill(ALL(S),1);
    auto B=count(N,S);
    LL res=0;
    for(auto &it:B)(res+=it)%=mod;
    (res+=mod-A.back())%=mod;
    cout<<res<<endl;
    return 0;
}