import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")

#######################################################################

ans = 0
n = ni()
mod = 10**9+7
if n <= 3:
    print(0)
    exit()

z = 15
dp = [[0 for j in range(16)]for i in range(n+1)]
dp[0][0] = 1
for i in range(n):
    for j in range(16):
        for k in range(2):
            ni = i + 1
            nj = z&((j<<1)|k)
            if nj == 10:
                continue
            dp[ni][nj] += dp[i][j]
            dp[ni][nj] %= mod

print((pow(2,n,mod)-sum(dp[-1]))%mod)