How to calculate the lift of a helium balloon?

Two forces act on the ball filled with helium: the force of gravity Ftyach and the force of Archimedes Farkh.
Ftyl = m * g, where m is the mass of helium in the ball, g is the acceleration of gravity.
m = ρg * V, where ρg is the density of helium, V is the volume of the sphere.
Ftyl = ρg * V * g.
Farch = ρw * g * V, where ρw is the air density, g is the acceleration of gravity, V is the volume of the ball.
The lifting force of the ball F will be the difference: F = Farch – Ftyazh = ρw * g * V – ρg * V * g = g * V * (ρw – ρg).
Answer: the lifting force of the ball is F = g * V * (ρw – ρg).