N = int(input())
# dp[i][K] = i段目にきて、最後に使ったのがKステップである

dp = [[0] * 4 for i in range(N + 1)]
dp[0][0] = 1
DIV = 10 ** 9 + 7

for i in range(N):
    for from_k in range(4):
        for to_k in range(1, 4):
            if from_k == to_k:
                continue
            if i + to_k > N:
                continue
            dp[i + to_k][to_k] += dp[i][from_k]
            dp[i + to_k][to_k] %= DIV
            
print(sum(dp[-1]) % DIV)