#region Header
#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
from queue import PriorityQueue
import bisect
import heapq

def input():
    return sys.stdin.readline()[:-1]

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """# paste here...
# """
# sys.stdin = io.StringIO(_INPUT)

MOD = 1000000007

def main():
    N = int(input())
    dp = [[0, 0, 0, 0] for _ in range(N+1)]
    dp[0][0] = 1
    for i in range(1, N+1):
        dp[i][0] = (dp[i-1][1] + dp[i-1][2] + dp[i-1][3]) % MOD
        dp[i][1] = (dp[i-1][0] + dp[i-1][2] + dp[i-1][3]) % MOD
        dp[i][2] = (dp[i-1][0] + dp[i-1][1] + dp[i-1][3]) % MOD
        dp[i][3] = (dp[i-1][0] + dp[i-1][1] + dp[i-1][2]) % MOD
    print(dp[N][0])


if __name__ == '__main__':
    main()