import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

# 行列累乗 NumPy用
import numpy as np

mod = 10 ** 9 + 7
def matrixPow(A, n, N):
	B = np.identity(N, dtype = np.int)
	while n > 0:
		if n & 1 == 1:
			B = (A @ B) % mod
		A = (A @ A) % mod
		n >>= 1
	return B


#処理内容
def main():
	N = int(input())
	A = np.array([[0, 1, 1, 1],[1, 0, 1, 1],[1, 1, 0, 1],[1, 1, 1, 0]])
	mat = matrixPow(A, N, 4)
	ans = mat @ np.array([[0], [0], [0], [1]])
	print(ans[3, 0])

if __name__ == '__main__':
	main()