Problem:
Score : 400 points

Problem Statement

Takahashi is going to buy N items one by one.

The price of the i-th item he buys is A_i yen (the currency of Japan).

He has M discount tickets, and he can use any number of them when buying an item.

If Y tickets are used when buying an item priced X yen, he can get the item for \frac{X}{2^Y} (rounded down to the nearest integer) yen.

What is the minimum amount of money required to buy all the items?

Constraints

All values in input are integers.

1 \leq N, M \leq 10^5

1 \leq A_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N M
A_1 A_2 ... A_N

Output

Print the minimum amount of money required to buy all the items.

Sample Input 1

3 3
2 13 8

Sample Output 1

9

We can buy all the items for 9 yen, as follows:

Buy the 1-st item for 2 yen without tickets.

Buy the 2-nd item for 3 yen with 2 tickets.

Buy the 3-rd item for 4 yen with 1 ticket.

Sample Input 2

4 4
1 9 3 5

Sample Output 2

6

Sample Input 3

1 100000
1000000000

Sample Output 3

0

We can buy the item priced 1000000000 yen for 0 yen with 100000 tickets.

Sample Input 4

10 1
1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000

Sample Output 4

9500000000

Solution in Python (3.4.3) (judge verdict: Runtime Error)

N, M = map(int, input().split())
A = list(map(int, input().split()))

A = sorted(A)[::-1]

waribiki = 0
index = 0

if len(A)==1:
    print(A[0]//pow(2,M))
    exit()

while waribiki < M:
    if index < N and A[index]>2 and A[index+1]>2:
        x = A[index] // A[index+1]
        if x+waribiki>M: x = M-waribiki
    else: x = 1

    if A[index] > 2:
        A[index] = A[index]//pow(2, x)
        waribiki+=x

    index += 1
    if index==N: index=0

print(sum(A))