import numpy as np

MOD = 10 ** 9 + 7

M = np.array([[0, 0, 1], [1, 0, 0], [1, 1, 0]])

doubling = [M]
for i in range(20):
    doubling.append(doubling[-1] @ doubling[-1])
    doubling[-1] = np.mod(doubling[-1], MOD)


N = int(input()) - 1
V = np.array([1, 0, 0])

for i in range(20)[::-1]:
    if N >> i & 1:
        V = doubling[i] @ V
        V = np.mod(V, MOD)

print(sum(V) % MOD)