생성일: 2022년 1월 6일 오전 1:25
# k번째 큰 수
import sys
sys.stdin = open("input.txt", "rt")
n, k = map(int, input().split())
numList = list(map(int, input().split()))
sumList = []
for i in range(n):
for j in range(i+1, n):
for l in range(j+1, n):
num = numList[i]+numList[j]+numList[l]
sumList.append(num)
sumList.sort(reverse=True)
count = 0
predNum = 0
for num in sumList:
if predNum != num:
count += 1
predNum = num
if count == k:
print(num)
break
# k번째 큰 수
import sys
sys.stdin = open("input.txt", "rt")
n, k = map(int, input().split())
numList = list(map(int, input().split()))
sumList = set()
for i in range(n):
for j in range(i+1, n):
for l in range(j+1, n):
num = numList[i]+numList[j]+numList[l]
sumList.add(num)
sumList = list(sumList)
sumList.sort(reverse=True)
print(sumList[k-1])