import heapq

import math

m,n=input().split(' ')

# c=0

n=int(n)

arr=list(map(int,input().split(' ')))

arr=[20,7,5,4]

narr=[]

# print(arr)

for i in arr:

narr.append(i*-1)

n=len(arr)-1

while(n):

n-=1

heapq.heapify(narr)

ele=heapq.heappop(narr)

# print(ele)

heapq.heappush(narr,math.ceil(ele//2))

# print(narr)

print(sum(narr)*-1)