import times, strutils, sequtils, math, algorithm, tables, sets, lists, intsets
import critbits, future, strformat, deques
template `max=`(x,y) = x = max(x,y)
template `min=`(x,y) = x = min(x,y)
template `mod=`(x,y) = x = x mod y
template scan2 = (scan(), scan())
template scan3 = (scan(), scan())
let read* = iterator: string {.closure.} =
    while true: (for s in stdin.readLine.split: yield s)
proc scan(): int = read().parseInt
proc scanf(): float = read().parseFloat
proc toInt(c:char): int =
    return int(c) - int('0')





proc solve():int=
  var
    n = scan()
    md = 10^9+7
    dp = newseqwith(10^6,newseqwith(4,0))
  if n>10^6:
    return 0
  else:
    dp[0][0]=1
  for i in 1..n:
    for t in 0..<4:
      for s in 0..<4:
        if t!=s:
          dp[i][t]+=dp[i-1][s]
      dp[i][t].mod=md
  #echo dp[0..5]
  return dp[n][0]


  
  
  
  
echo solve()