'''
Bunny Prisoner Locating
=======================

Keeping track of Commander Lambda's many bunny prisoners is starting to get tricky.
You've been tasked with writing a program to match bunny prisoner IDs to cell locations.

The LAMBCHOP doomsday device takes up much of the interior of Commander Lambda's
space station, and as a result the prison blocks have an unusual layout.
They are stacked in a triangular shape, and the bunny prisoners are given
numerical IDs starting from the corner, as follows:

| 7
| 4 8
| 2 5 9
| 1 3 6 10

Each cell can be represented as points (x, y), with x being the distance from
the vertical wall, and y being the height from the ground.

For example, the bunny prisoner at (1, 1) has ID 1, the bunny prisoner at (3, 2)
has ID 9, and the bunny prisoner at (2,3) has ID 8. This pattern of numbering
continues indefinitely (Commander Lambda has been taking a LOT of prisoners).

Write a function answer(x, y) which returns the prisoner ID of the bunny
at location (x, y). Each value of x and y will be at least 1 and no
greater than 100,000. Since the prisoner ID can be very large, return
your answer as a string representation of the number.
'''
def answer(x,y):
    mult = ((x + 1) / 2.0)
    total = int(x * mult)
    i = 0
    while i < (y-1):
        total = total + (x + i)
        i = i + 1
    return str(total)
