package no_0314;

import java.util.Scanner;
import java.util.stream.LongStream;

public class KenkenPa02 {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

//		while(true) {
		int N = sc.nextInt();

		long ways = 0;
		long[][] prev = {{0L, 0L},
					    {1L, 1L}};
		

		if(N == 1) {
			ways = 1;
			System.out.println(ways);
			return;
		}else if(N == 2) {
			ways = 2;
			System.out.println(ways);
			return;
		}

		for(int i = 3; i <= N; i++) {
			long[][] temp = new long[2][2];
			temp[1][1] = prev[0][1];
			temp[1][0] = prev[0][1] + prev[1][1];
			temp[0][1] = prev[1][0];
			prev = temp.clone();
		}

		for(long[] p: prev) {
			ways += LongStream.of(p).sum();
		}
		System.out.println(ways % (1000000000 + 7));
//	}
	}

}