This Epidemic model creates 300 healthy turtles and sets their color to blue, creates 3 sick turtles and sets their color to red, and has the turtles wiggle around the world and transmit the epidemic on collision with a sick turtle.
Your task is to add a slider that allows you to change the initial population of healthy turtles to a range between 100-500. First create the slider using the edit widgets button on the interface, and then look in the interface drawer to add the necessary code into the model.