N = int(raw_input())
MOD = 1000000000 + 7
a = 1
b = 0
c = 0
d = 0
e = 0
f = 0
for i in range(1,N + 1):
	#dp[i][1] = (dp[i][1] + dp[i - 1][0]) % MOD
	b = (b + a) % MOD
	#dp[i][2] = (dp[i][2] + dp[i - 1][1]) % MOD
	d = (d + c) % MOD
	#dp[i][0] = (dp[i][0] + dp[i - 1][1]) % MOD
	e = (e + c) % MOD
	#dp[i][0] = (dp[i][0] + dp[i - 1][2]) % MOD
	e = (e + f) % MOD
	a = e
	c = b
	f = d
	e = 0
	b = 0
	d = 0
ans = (a + c + f) % MOD
#for i in range(3):
	#ans = (ans + dp[N][i]) % MOD
print ans