import strutils
import sequtils
import math

var n = stdin.readLine.parseInt
var memo = newSeqWith(n+1, newSeqWith(3, (-1).int64))

proc dp_inner(i :int64, k :int) :int64
proc dp(n :int64, k :int) :int64

memo[1][0] = 0
memo[1][1] = 1
memo[1][2] = 0

memo[2][0] = 1
memo[2][1] = 0
memo[2][2] = 1

memo[3][0] = 1
memo[3][1] = 1
memo[3][2] = 0

proc dp_inner(i :int64, k :int) :int64 =

  if k == 2:
    return dp(i-1, 0)
  elif k == 1:
   return dp(i-1, 2) + dp(i-1, 0)
  else:
   return dp(i-1, 1)

proc dp(n :int64, k :int) :int64 =

  if memo[n][k] != -1:
    return memo[n][k]
  else:
    memo[n][k] = dp_inner(n, k)
    return memo[n][k]


echo (dp(n, 0) + dp(n, 1) + dp(n, 2))  mod (10^9 + 7)