import itertools

N, V = map(int, input().split())
packs = list(map(int, input().split()))
com = [i + 1 for i in range(V - N + 1)] * N
com_list = sorted(list(set(itertools.combinations(com, N))), reverse=True)
com_list_v = []
for c in com_list:
    temp = sorted(c, reverse=True)
    if sum(temp) == V and temp not in com_list_v:
        com_list_v.append(temp)

min_price = float('inf')
if N >= V:
    min_price = sum(packs)
else:
    for v in com_list_v:
        tmp = 0
        for i in range(len(v)):
            tmp += packs[i] * v[i]

        if min_price > tmp:
            min_price = tmp

print(min_price)