#include <bits/stdc++.h>

using namespace std;

//macro
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define REP(i,n) FOR(i,0,n)

using ll = long long;

int dp[1000010][3];

int main(void) {
	int mod = 1e9 + 7;
	int n; cin >> n;
	REP(i, n)REP(j, 3)dp[i][j] = 0;
	dp[1][1] = 1;//ケン
	for (int i = 1; i < n; ++i) {
		(dp[i + 1][1] += dp[i][0]) %= mod;//->ケン
		(dp[i + 1][0] += dp[i][1]) %= mod;//->パー
		(dp[i + 1][2] += dp[i][1]) %= mod;//->ケンケン
		(dp[i + 1][0] += dp[i][2]) %= mod;//->パー
	}

	ll ans = 0;
	REP(i, 3) {
		(ans += dp[n][i]) %= mod;
	}
	cout << ans%mod << "\n";
	return 0;
}