import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        long n = koko.nextLong();
        if(n%2==0){
            long t = (n/2)%1000007;
            long a = (t*t+n)%1000007;
            System.out.println(a);
        }else{
            long a = ((n+1)/2)%1000007;
            n = n%1000007;
            long b = n*a;
            b=b%1000007;
            long c = a*a;
            c=c%1000007;
            long ans = (b-c+n);
            System.out.println((long)ans);
        }
    }
    
}