Blister copper is produced by reaction of copper oxide with copper sulphide.

2Cu₂O + Cu₂S $\to$ 6Cu + SO₂

When 2.86 $\times$ 10³ g of Cu₂O and 4.77 $\times$ 10³ g of Cu₂S are used for reaction, the mass of copper produced is _____________ g. (nearest integer)

(Atomic mass of Cu = 63.5 a.m. u, S = 32.0 a.m. u, O = 16.0 a.m. u)