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

DP=[0]*16; DP[0]=1
Ans=0

for _ in range(N):
    E=DP.copy()
    DP=[0]*16

    for i in range(16):
        p=(i<<1)&15
        DP[p]+=E[i]
        DP[p+1]+=E[i]

    for i in range(16):
        DP[i]%=Mod

    Ans=(2*Ans+DP[10])%Mod
    DP[10]=0

print(Ans)