import java.util.*;
import java.util.Arrays;

class Main{
	static int n;

	static long memo[][] = new long[1000010][3];

	static long saiki(int now,int how_ken){
		if(now == n) return 1;
		if(memo[now][how_ken] != -1) return memo[now][how_ken];
		long sum = 0;
		if(how_ken == 0){
			sum += saiki(now + 1,1);
		}else if(how_ken == 2){
			sum += saiki(now + 1,0);
		}else{
			sum += saiki(now + 1,how_ken + 1);
			sum += saiki(now + 1,0);
		}
		return memo[now][how_ken] = sum % 1000000007;
	}

	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		n = sc.nextInt();
		for(int i = 0;i < 1000010;i++){
			for(int j = 0;j < 3;j++){
				memo[i][j] = -1;
			}
		}
		System.out.println(saiki(0,0) % 1000000007);
	}
}