C$++$ Classes and vectors$/$classes$.$The program first reads integer townCount from input, representing the number of pairs of inputs to be read. Each pair has a string and an integer, representing the towns name and population, respectively. One Town object is created for each pair and added to vector townList. Write the FindAverageTownPopulation$()$ function in the SmallCities class to return the average population of all the Town objects as an integer.Example: If the input is: $3$Worland $4503$ Thayne $3800$ Opal $2800$then the output is: Average town population: $3701$Note: The ArrayList has at least one element.