With what force are two books with a mass of 300 g, which are at a distance of 2 m from each other

With what force are two books with a mass of 300 g, which are at a distance of 2 m from each other, are attracted to each other.

m1 = m2 = 400 g = 0.4 kg.
r = 2 m.
G = 6.67 * 10 ^ -11 H * m ^ 2 / kg ^ 2.
F -?
According to the law of universal gravitation, the force of interaction between bodies is determined by the formula:
F = G * m1 * m2 / r ^ 2.
Where G is the gravitational constant, m1, m2 are the masses of bodies between which there is an attractive force, r is the distance between bodies.
F = 6.67 * 10 ^ -11 H * m ^ 2 / kg ^ 2 * 0.4 kg * 0.4 kg / (2 m) ^ 2 = 0.2668 * 10 ^ -11 H.
Answer: between the bodies there is an attractive force F = 0.2668 * 10 ^ -11 H.