package yukicoder;

import java.math.BigDecimal;
import java.util.Scanner;

public class N314 {
	long[][] dp;
	int n;
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		
		N314 inst = new N314();
		inst.solve(n);
	}
	
	public void solve(int n){
		this.n = n;
		dp = new long[n][n];
		System.out.println(BigDecimal.valueOf(calc(0, 0) % (Math.pow(10, 9) + 7)));
	}
	
	public long calc(int k, int l){
		long fuga;
		
		if(k >= this.n) return 1;
		
		if(dp[k][l] != 0){
			return dp[k][l];
		}
		
		if(l >= 2){
			fuga = calc(k + 1, 0);
			dp[k][l] = fuga;
			return fuga;
		}else if(l == 1){
			fuga = calc(k + 1, 2) + calc(k + 1, 0);
			dp[k][l] = fuga;
			return fuga;
		}else{
			fuga = calc(k + 1, 1);
			dp[k][l] = fuga;
			return fuga;
		}
	}
}