a=input()
a=int(a)
b=input()
b=int(b)
c=input()
c=c.split()
c=[int(i)for i in c]
c.sort()
c=c[::-1]
cnt=0
for i in range(b):
cnt+=c[i]
print(cnt)
#1234567890qwertyuiopasdfghjkl;'zxcvbnm,./
#(凑字数）
#对不起,上一次把题目打错了,请谅解