import java.util.Scanner;

public class Main{
	
	public static Long fib(long n) {
		
		long i = n;
		long ans = 0;
		while(true){
			ans += i;
			i--;
			if(i == 0){
				break;
			}
		}
		return ans;
	}
	
	public static void main(String[] args){
		Scanner s = new Scanner(System.in);
		long n = Long.parseLong(s.next());
		long fib1 = fib(n);
		long fib2 = fib(fib1);
		long ans = fib2 % ((long) Math.pow(10, 9)) + 7;
		System.out.println(ans);
		s.close();
	}

}