MOD = 10 ** 9 + 7


def mult(A, B, N):
    C = [[0] * N for _ in range(N)]
    for i in range(N):
        for j in range(N):
            for k in range(N):
                C[i][j] += A[i][k] * B[k][j]
            C[i][j] %= MOD
    return C


def mat_power(A, N, n):
    if n == 0:
        res = [[0] * N for _ in range(N)]
        for i in range(N):
            res[i][i] = 1
        return res
    X = mat_power(A, N, n // 2)
    X = mult(X, X, N)
    return mult(A, X, N) if n & 1 else X


n = int(input())
print(mat_power([[0, 1], [3, 2]], 2, n)[0][0])