a = gets.split.map(&:to_i)
b = []
a[0].times do
  b << gets.split.map(&:to_i)
end

init_memo = b.first

memo = [init_memo]
a[0].times do |n|
  memo.last.uniq!
  tmp = []
  a[1].times do |m|
    break unless b[n+1]
    memo.last.length.times do |l|
      sum = memo[n][l] + b[n+1][m]
      sum <= a[2] ? tmp << sum : next
    end
  end
  memo << tmp
end

memo.each {|n| memo.delete(n) if n.empty?}
p memo.count == a[0] ?  a[2] - memo.last.max : -1