from enum import IntEnum, auto
from functools import cache


class E(IntEnum):
    S = 0  # 開始
    K = auto()  # ケン
    KK = auto()  # ケンケン
    P = auto()  # パ

    def nexts(self):
        match self:
            case E.S:
                return [E.K]
            case E.K:
                return [E.KK, E.P]
            case E.KK:
                return [E.P]
            case E.P:
                return [E.K]
        assert False

    @staticmethod
    @cache
    def states():
        res = []
        for fm in E:
            for to in fm.nexts():
                res.append((fm, to))

        return res


def state_dp(xs: list, op, e, init: dict):
    dp = [e for _ in range(len(E))]
    for k, v in init.items():
        dp[k] = v

    for x in xs:
        pp = [e for _ in range(len(E))]
        dp, pp = pp, dp
        for fm, to in E.states():
            if not is_valid(to, pp[fm], x): continue
            dp[to] = op(to, dp[to], fm, pp[fm], x)

    return dp


def is_valid(to: E, fm_v, v) -> bool:
    return True


def op(to: E, to_v, fm: E, fm_v, v):
    return (to_v + fm_v) % MOD


MOD = 10**9 + 7
N = int(input())

dp = state_dp(list(range(N)), op, 0, {E.S: 1})
ans = sum(dp) % MOD
print(ans)