What work must be done to lift a stone weighing 3 kg and a volume of 1.2 m3 from the bottom of the river

What work must be done to lift a stone weighing 3 kg and a volume of 1.2 m3 from the bottom of the river to the surface of the water. The depth of the river is 4 m. Water resistance is negligible.

Two forces act on a stone in water: the force of gravity is equal
F = m * g = 3 * 10 = 30 n and an Archimedean force equal to Fa = ρ * v = 1000 * 1.2 = 1200 n.
The resultant forces will be equal to:
1200-30 = 1170 n.
The work done by the force A = F * s where S is the path, then we get:
A = 1170 * 4 = 4680 J.