Frozen Cherry Limeade Pie

graham cracker pie crust (I used store bought, but I've been known to make my own from time to time...whatever floats your boat)

can sweetened condensed milk

container frozen whipped topping

frozen limeade concentrate, thawed

small jar maraschino cherries, drained, rinsed, and sliced into halves

Additional whipped topping to top pie, if desired