백준 2798번(python)

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from itertools import combinations

N, M = map(int, input().split())
num_list = list(map(int, input().split()))
res_list = []
for comb in combinations(num_list, 3):
    comb_sum = sum(comb)
    res_list.append(comb_sum)
    
res_list = list(filter(lambda t: t <= 0,list(set(map(lambda x : x - M, res_list)))))
res_list = sorted(res_list, key = int, reverse = True)
print(M + res_list[0])