#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
const Int MAX = 1e6+100;
const Int MOD = 1e9+7;
Int dp[4][MAX];
signed main(){
  Int n;
  cin>>n;
  memset(dp,0,sizeof(dp));
  dp[0][0]=1;
  for(Int i=0;i<n;i++){
    for(Int j=0;j<4;j++){
      dp[j][i]%=MOD;
      if(j+1<3) dp[j+1][i+1]+=dp[j][i];
      if(j) dp[0][i+1]+=dp[j][i];
    }
  }
  Int ans=0;
  for(Int j=0;j<4;j++){
    dp[j][n]%=MOD;
    ans+=dp[j][n];
    ans%=MOD;
  }
  cout<<ans<<endl;
  return 0;
}