#include<iostream>
#include<string.h>

using namespace std;
const int limn = 1e6;
int dp[limn+10][3];
int divn = 1e9 + 7;
int main(){
	memset(dp,0,sizeof(dp));
	int n;
	cin >> n;
	
	dp[0][0] = 1;
	
	for(int i = 0;i < n;i++){
		for(int j = 0;j < 3;j++){
			for(int k = 0;k < 3;k++){
				if(i==0){
					dp[i+k+1][k] = (dp[i+k+1][k] + dp[i][j]) % divn;
				}else{
					if(j != k){
						dp[i+k+1][k] = (dp[i+k+1][k] + dp[i][j]) % divn;
					}
				}
			}
		}
	}
	
	int ans = 0;
	for(int i = 0;i < 3;i++) ans = (ans + dp[n][i]) % divn;
	
	cout << ans << endl;
	return 0;
}