PROBLEM STATEMENT
The hotel industry  is difficult to thrive in, especially when competing at a resort city like Las 
Vegas.  
Marketing is essential and often gets a large part of total revenues.  You have a list of cities 
you can market at, 
and a good estimate of how many customers you will get for a certain amount of money spent at each 
city.  


You are given int[]s customers and cost.  cost[i] is the amount of money required to get 
customers[i] customers from the i-th city.  You are only allowed to spend integer multiples of the 
cost for any city. For example, if it costs 9 to get 3 customers from a certain city, you can 
spend 9 to get 3 customer, 18 to get 6 customers, 27 to get 9 customers, but not 3 to get 1 
customer, or 12 to get 4 customers.  Each city has an unlimited number of potential customers.  
Return the minimum amount of money required to get at least minCustomers customers.

DEFINITION
Class:Hotel
Method:marketCost
Parameters:int, vector <int>, vector <int>
Returns:int
Method signature:int marketCost(int minCustomers, vector <int> customers, vector <int> cost)


CONSTRAINTS
-minCustomers will be between 1 and 1000, inclusive.
-customers will contain between 1 and 20 elements, inclusive.
-cost will have the same number of elements as customers.
-Each element of cost and customers will be between 1 and 100, inclusive.


EXAMPLES

0)
10
{1,2,3}
{3,2,1}

Returns: 4

Just get 12 customers from the third city.

1)
10
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

Returns: 10

It does not matter from which city you get your customers.

2)
12
{5, 1}
{3, 1}

Returns: 8

Get 10 customers from the first city, and 2 from the second city.

3)
100
{9, 11, 4, 7, 2, 8}
{4, 9, 3, 8, 1, 9}

Returns: 45



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