53C

//I_love_StarnyC 
#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define f first
#define s second
#define pb push_back
#define fix  cout<<std::fixed;
#define mk make_pair
#define mod 1000000007
#define time  cerr<< '\n' << "Time elapsed :" << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n" ;
#define IOS        ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
 
ll binexp(ll x,ll y)
{
    ll res=1;
    while(y>0)
    {   if(y&1)
        res=(res*x)%mod;
        x=((x%mod)*(x%mod)%mod);
        y=y>>1;
    }
    return res%mod;
}
 
int main()
{  
   ll n;cin>>n;
   ll dp[2*n+1];
   dp[0]=1;
   for(int i=1;i<=2*n-1;i++)
   {
    dp[i]=(i*dp[i-1])%mod;
   }
   ll ans=((binexp(dp[n],mod-2)*binexp(dp[n-1],mod-2))%mod)%mod;
   ans=(ans*2*dp[2*n-1])%mod;
   cout<<(ans+mod-n)%mod;
 
}