from functools import lru_cache


n = int(input())

@lru_cache(maxsize=1000000)
def kp(n):
    if n in [1, 2]:
        return n
    else:
        a1, a2 = 1, 2
        for _ in range(n-2):
            a1, a2 = a2, (a2+a1//2)%(10**9+7)
        return a2


print(kp(n)%(10**9+7))