n=int(input())
N=(n+1)//2
mod=10**9+7

dp=[[0,0]for i in range(N)]
dp[0][0]=2
dp[0][1]=2

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