n = int(input())
l = [int(i) for i in (input().strip().split(" "))]
l.sort()

c = 0 # 时间
k = 0 # 楼层
c += 4*l[-1]
for i in l:
    if i != k:
        c += 6 * (i-k) + 5 + l.count(i)
        k = i
print(c)