#include<bits/stdc++.h>
using namespace std;
#define int long long
int dp[3][10000200];
int MOD=1000000007LL;
signed main(){
  memset(dp,0,sizeof(dp));
  int n;
  cin>>n;
  for(int i=0;i<3;i++) dp[i][i+1]=1;
  for(int i=0;i<n;i++){
    for(int j=0;j<3;j++){
      for(int k=0;k<3;k++){
	if(j==k) continue;
	(dp[k][i+k+1]+=dp[j][i])%=MOD;
      }
    }
  }
  int ans=0;
  (ans+=dp[0][n])%=MOD;
  (ans+=dp[1][n])%=MOD;
  (ans+=dp[2][n])%=MOD;
  cout<<ans<<endl;
  return 0;
}