import java.util.*;

public class Main {
    static final int MOD = 1000000007;
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[][][] dp = new int[n + 1][2][2];
		dp[1][1][0] = 1;
		for (int i = 2; i <= n; i++) {
		    for (int j = 0; j < 2; j++) {
		        for (int k = 0; k < 2; k++) {
	                if (k == 0) {
	                    dp[i][k][1] += dp[i - 1][j][k];
	                    dp[i][k][1] %= MOD;
	                }
	                if (j != 0 || k != 0) {
	                    dp[i][k][0] += dp[i - 1][j][k];
	                    dp[i][k][0] %= MOD;
	                }
		        }
		    }
		}
		int total = 0;
	    for (int j = 0; j < 2; j++) {
	        for (int k = 0; k < 2; k++) {
                total += dp[n][j][k];
                total %= MOD;
	        }
	    }
		System.out.println(total);
	}
}