A site consists of 3m thick unsaturated swelling soil deposit with the following properties: total unit weight 18kN/m3, initial void ratio 0.8, swelling index 0.4 and corrected swelling pressure Ps = 220KPA. Calculate the total amount of heave for the entire thickness when the final pore water pressure is equal to -5kpa throughout the deposit. The air pressure is atmospheric in the field. In the calculation, treat the entire thickness of soil as one layer, subdivisions are not required