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

A = [[1,1,1,0],[1,0,0,1],[2,0,1,0],[0,0,0,1]]
def seki(X,Y):
    ans = [[0] * 4 for _ in range(4)]
    for i in range(4):
        for j in range(4):
            for k in range(4):
                ans[i][j] = (ans[i][j] + X[i][k]*Y[k][j]) % P
    return ans

tmp = [[1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]]
u = N-1
while u:
    if u & 1:
        tmp = seki(tmp,A)
    A = seki(A,A)
    u >>= 1
gn = tmp[0][0] + tmp[0][1] + tmp[0][3]

print(gn%P)