n = int(input())
mat = [[0,0,1],[1,0,0],[1,1,0]]

mod = 1000000007

ret = [[1,0,0],[0,1,0],[0,0,1]]
while n>0 :
	if (n&1) == 1 :
		tmp = [[0,0,0],[0,0,0],[0,0,0]]
		for i in range(3) :
			for k in range(3) :
				for j in range(3) :
					tmp[i][j] += ret[i][k] * mat[k][j]
					if tmp[i][j] >= mod :
						tmp[i][j] %= mod
		ret = tmp

	tmp_ = [[0,0,0],[0,0,0],[0,0,0]]
	for i in range(3) :
		for k in range(3) :
			for j in range(3) :
				tmp_[i][j] += mat[i][k] * mat[k][j]
				if tmp_[i][j] >= mod :
					tmp_[i][j] %= mod
	mat = tmp_

	n = n>>1

ans = (ret[0][2] + ret[1][2] + ret[2][2]) % mod

print(ans)