#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
import numpy as np

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

sys.setrecursionlimit(1000000)
#endregion

# _INPUT = """334
# """
# 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])

    A = np.matrix([
        [0, 1, 1, 1],
        [1, 0, 1, 1],
        [1, 1, 0, 1],
        [1, 1, 1, 0]], dtype=object)
    # A_N = np.linalg.matrix_power(A, N)

    M = A
    R = np.identity(4, dtype=object)
    while N > 0:
        if N & 1 > 0:
            R = (R * M) % MOD
        M = (M * M) % MOD
        N >>= 1
    v = R * np.array([[1], [0], [0], [0]])

    print(v.item(0, 0) % MOD)


if __name__ == '__main__':
    main()