N, K = map(int, input().split())
Aa = list(map(int, input().split()))
A = sorted(Aa, reverse=True)
Apre = 0
cnt = 0
num = -1
for i in range(K):
  cnt += A[i]
  if Apre < cnt:
    Apre = cnt
  else:
    num = i
    break
print(sum(A[:num]) if num>=0 else sum(A[:K]))