#include <iostream>
#include <queue>
using namespace std;
const int mod = 1e9+7;
int main(void){
    int n;
    long long dp[100000][4];
    queue<long long> memo[4];
    cin >> n;
    if(n==1){
        cout << "1" << endl;
        return 0;
    }
    if(n == 2){
        cout << "2" << endl;
        return 0;
    }
    memo[1].push(1);
    memo[2].push(0);
    memo[3].push(0);

    memo[1].push(0);
    memo[2].push(1);
    memo[3].push(0);

    memo[1].push(1);
    memo[2].push(1);
    memo[3].push(1);

    long long m[5][4];

    for(int i=4; i<=n; i++){
        m[1][1] = memo[1].front();
        m[1][2] = memo[2].front();
        m[1][3] = memo[3].front();

        memo[1].pop();
        memo[2].pop();
        memo[3].pop();

        m[2][1] = memo[1].front();
        m[2][2] = memo[2].front();
        m[2][3] = memo[3].front();
        
        memo[1].pop();
        memo[2].pop();
        memo[3].pop();

        m[3][1] = memo[1].front();
        m[3][2] = memo[2].front();
        m[3][3] = memo[3].front();
        
        memo[1].pop();
        memo[2].pop();
        memo[3].pop();

        m[4][3] = (m[1][2] + m[1][1])%mod;
        m[4][2] = (m[2][1] + m[2][3])%mod;
        m[4][1] = (m[3][2] + m[3][3])%mod;

        memo[1].push(m[2][1]);
        memo[2].push(m[2][2]);
        memo[3].push(m[2][3]);

        memo[1].push(m[3][1]);
        memo[2].push(m[3][2]);
        memo[3].push(m[3][3]);

        memo[1].push(m[4][1]);
        memo[2].push(m[4][2]);
        memo[3].push(m[4][3]);
        
    }
    memo[1].pop();
    memo[2].pop();
    memo[3].pop();

    memo[1].pop();
    memo[2].pop();
    memo[3].pop();

    cout << (memo[1].front()+memo[2].front()+memo[3].front())%mod << endl;
    return 0;
}