#include <algorithm>
#include <cstdio>
#include <iostream>
#include <iomanip>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
const long long MOD = 1000000007;
long long dp[1000000][4];
int main(){
  long long n;
  cin >> n;
  FOR(i,0,n+1){
    FOR(j,0,4){
      dp[i][j] = 0;
    }
  }
  dp[0][0] = 1;
  FOR(i,1,n+1){
    FOR(j,1,4){
      FOR(k,0,4){
        if(j == k) continue;
        if(i - j < 0) continue;
        dp[i][j] += dp[i-j][k];
        dp[i][j] %= MOD;
      }
    }
  }
  cout << (dp[n][1]+dp[n][2]+dp[n][3]) % MOD << endl;
  return 0;
}