import strutils, sequtils

const MOD = 1000007

when isMainModule:
  var
    n = stdin.readline.parseBiggestInt
    a = n div 2
    b = a + 1
    x = ((a * n mod MOD + n) mod MOD - (a * a) mod MOD + MOD) mod MOD
    y = ((b * n mod MOD + n) mod MOD - (b * b) mod MOD + MOD) mod MOD
  echo max(x, y)