$n = gets.to_i
def func(x)
    return (x + 1) * ($n - x + 1) - 1
end
MOD = 10 ** 6 + 7
if $n % 2 == 0
    puts func($n / 2) % MOD
else
    puts [func($n / 2), func($n / 2 + 1)].min % MOD
end