import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {
	
	public static long calc(final long N, final long k, final long MOD){
		return ((k * ((N - k) % MOD) % MOD) + (N % MOD)) % MOD;
	}
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		
		System.out.println(calc(N, N / 2, 1000007)); 
	}
	
}