N = int(input())

Amaru = list(range(10**6 + 1))
Abatsu = list(range(10**6 + 1))

Amaru[1] = 0
Abatsu[1] = 1
Amaru[2] = 1
Abatsu[2] = 1

for i in range(3, N + 1):
	Amaru[i] = Abatsu[i - 1]
	Abatsu[i] = Amaru[i - 1] + Amaru[i - 2]

print((Amaru[N] + Abatsu[N]) % 1000000007)