N = int(input())
mod = 10 ** 9 + 7
pre = [0] * 16
ans = 0
pre[0] = 1
for i in range(N):
    dp = [0] * 16
    for j in range(16):
        if j == 10:
            continue
        nj = (j << 1) % 16
        dp[nj] += pre[j]
        nj = ((j << 1) + 1) % 16
        dp[nj] += pre[j]
        dp[j] %= mod
        dp[nj] %= mod
    ans += dp[10] * pow(2, N - i - 1, mod)
    ans %= mod
    pre, dp = dp, pre

print(ans)