import sys
import math


def func(n, u):
    return u * (n - u + 1) + (n - u)


n = int(input())
l = 0
r = n
while r - l > 2:
    ml = (l * 2 + r) // 3
    mr = (l + r * 2) // 3
    if func(n, ml) > func(n, mr):
        r = mr
    else:
        l = ml
print(max(func(n, l), func(n, l + 1), func(n, r)) % 1000007)