local n, m, k = io.read("*n", "*n", "*n")
local t = {}
for i = 1, m do
  local a = io.read("*n")
  if a <= k then
    table.insert(t, a)
  end
end
for i = 2, n do
  local tbl = {}
  for j = 1, m do
    local a = io.read("*n")
    for p = 1, #t do
      if a + t[p] <= k then
        tbl[a + t[p]] = true
      end
    end
  end
  t = {}
  for k, _u in pairs(tbl) do
    table.insert(t, k)
  end
end
table.sort(t)
if #t == 0 then
  print(-1)
else
 print(k - t[#t])
end