p = 10**9+7
def pow(x,m):
    if m==0:
        return 1
    if m==1:
        return x
    if m%2==0:
        return (pow(x,m//2)**2)%p
    else:
        return (x*(pow(x,(m-1)//2)**2)%p)%p
N = int(input())
a = (pow(3,N)+3*pow(p-1,N))%p
a = (a*pow(4,p-2))%p
print(a)