local n, k = io.read("*n", "*n")
a = {}
for i = 1, n do
  a[i] = io.read("*n")
end
table.sort(a, function(q, w) return q > w end)
s = a[1]
for i = 2, k do
  if 0 < a[i] then
    s = s + a[i]
  end
end
print(s)