/* You are writing an embedded application for a grocery store hand scanner. The application is designed to help grocery clerks do end-cap displays of large pyramid can stacks. You input the height of the stack in rows of cans and the application will output the number of cans needed for the stack. A stack starts with one can at the top and each row below has one additional can. Here is an example of a stack of height 4: * * * * * * * * * * So the output of 4 is 10, the total number of cans in the stack. 1. Write a function or collection of functions that, given the height of the stack in rows of cans, returns the number of cans in the entire stack.