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

dp = [[[0]*3 for _ in range(2)] for _ in range(N)]
dp[0][0][1] = 1
for i in range(1, N):
    dp[i][0][1] += dp[i-1][1][0]
    dp[i][0][2] += dp[i-1][0][1]
    dp[i][1][0] += dp[i-1][0][2]+dp[i-1][0][1]
    dp[i][0][1] %= mod
    dp[i][0][2] %= mod
    dp[i][1][0] %= mod
print((dp[-1][0][1]+dp[-1][0][2]+dp[-1][1][0])%mod)