local mmi, mma = math.min, math.max
local n, m = io.read("*n", "*n")
local w = {}
for i = 1, n do
  w[i] = io.read("*n")
end
if m == 0 then print(0) os.exit() end
local inf = 1000000007
local dp1a, dp1b = {}, {}
local dp2a, dp2b = {}, {}
dp1a[1] = 0
dp1b[1] = -inf
for i = 2, n do
  local srca = i % 2 == 0 and dp1a or dp2a
  local srcb = i % 2 == 0 and dp1b or dp2b
  local dsta = i % 2 == 0 and dp2a or dp1a
  local dstb = i % 2 == 0 and dp2b or dp1b
  dsta[1] = -inf
  for j = 2, i do
    dsta[j] = mma(srca[j - 1] + w[i - 1], srcb[j - 1])
    if i == n then
      dsta[j] = dsta[j] + w[n]
    end
  end
  for j = 1, i - 1 do
    dstb[j] = mma(srca[j], srcb[j])
  end
  dstb[i] = -inf
end
local tbla = n % 2 == 0 and dp2a or dp1a
local tblb = n % 2 == 0 and dp2b or dp1b
local ret = mma(tbla[m], tblb[m])

dp1a[1] = -inf
dp1b[1] = -inf
for i = 2, n do
  local srca = i % 2 == 0 and dp1a or dp2a
  local srcb = i % 2 == 0 and dp1b or dp2b
  local dsta = i % 2 == 0 and dp2a or dp1a
  local dstb = i % 2 == 0 and dp2b or dp1b
  dsta[1] = 0
  for j = 2, i - 1 do
    dsta[j] = mma(srca[j - 1] + w[i - 1], srcb[j - 1])
  end
  dsta[i] = -inf
  for j = 1, i - 1 do
    dstb[j] = mma(srca[j], srcb[j])
  end
  dstb[i] = -inf
end

tbla = n % 2 == 0 and dp2a or dp1a
tblb = n % 2 == 0 and dp2b or dp1b
ret = mma(ret, tbla[m], tblb[m])

print(ret)