If Kelvin Eats 1 4 Of A Pie Kristy Eats 1 3 Of Whats Left After Kelvin Is Done A

If kelvin eats 1/4 of a pie, Kristy eats 1/3 of whats left after Kelvin is done, and Kelly eats 1/2 of whats left after Kristy is done, then what part of the pie is left?