Net Work Done By Torques

Three torques are applied to a rigid wheel: $$\tau_1 = 4.0\ \mathrm{N \cdot m}$$ at an angle of $$0^\circ$$, $$\tau_2 = 3.0\ \mathrm{N \cdot m}$$ at $$90^\circ$$, and $$\tau_3 = 5.0\ \mathrm{N \cdot m}$$ at $$270^\circ$$. If the wheel undergoes an angular displacement of 1.5 radians in the $$0^\circ$$ direction, what is the net work done by the torques?