a proton, Mp, is 1800 times the mass of an electron, Me, what is the gravitational force of attraction (in Newtons) between a proton and an electron?...

If the mass of a proton, Mp, is 1800 times the mass of an electron, Me, what is the gravitational force of attraction (in Newtons) between a proton and an electron? (assume the distance between them is 5 x 10-11 meter, and the mass of an electron is 9.1 x 10-31 kg)