There are two bodies with an initial temperature T₁ and T₂. The heat capacity of these bodies is equal to C₁ and C₂ and does not depend on temperature. One body is used as a heater, the other as a refrigerator in a heat machine. Find the maximum amount of work that can be obtained in this way. Calculate when the first body is 1 kg of boiling water, the second — 1 kg of water at a temperature of 0°C.