def K(N):
    if N == 1:
        return 1
    elif (N == 2) or (N == 3):
        return 2
    elif N == 4:
        return 3
    li = [1, 1]
    a, b, c = 1, 0, 1
    for i in range(N-3):
        a, b, c = b, c, a + b
        if i == N - 6:
            li[0] = c
        elif i == N - 5:
            li[1] = c
    result = (c + 2 * li[1] + li[0]) % (10 ** 9 + 7)
    return result

if __name__ == '__main__':
    N = int(input())
    print(K(N))