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

def seki(x,y):
    l = [[0] * 4 for _ in range(4)]
    for i in range(4):
        for j in range(4):
            for k in range(4):
                l[i][j] = (l[i][j] + x[i][k] * y[k][j]) % P
    return l
A = [[0,1,1,1,],[1,0,1,1,],[1,1,0,1,],[1,1,1,0]]
tmp = [[1,0,0,0,],[0,1,0,0,],[0,0,1,0,],[0,0,0,1]]
while N:
    if N & 1:
        tmp = seki(tmp,A)
    A = seki(A,A)
    N >>= 1
print(A[0][0])