local n = io.read("*n")
local m = io.read("*n")
local a = {}; do
  for i = 1, n do
    a[i] = io.read("*n")
  end
end

local psum_scaleless = {(a[1] / 1)}
local psum_scaleless_min = psum_scaleless[1]
do
  for i = 2, n do
    psum_scaleless[i] = (psum_scaleless[i - 1] * (i - 1) + a[i]) / i
    if psum_scaleless[i] < psum_scaleless_min then
      psum_scaleless_min = psum_scaleless[i]
    end
  end
end

local ans = (function ()
  return math.floor(psum_scaleless_min / m)
end)()

print(ans)