#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint1000000007;
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
  int n;cin>>n;
  int b=1<<3;
  vc dp(n+1,vc<mint>(b,0)); dp[0][0]=1;
  mint ans=0;
  rep(z,n){
    rep(i,b)rep(j,2){
      int next=(i<<1)|j;
      if(next==10){
        ans+=dp[z][i]*mint(2).pow(n-z-1);
        continue;
      }
      next&=b-1;
      dp[z+1][next]+=dp[z][i];
    }
  }
  cout<<ans.val();
}