n, k = read_line.split.map(&.to_i)
a = read_line.split.map(&.to_i64)
b = read_line.split.map(&.to_i64)
c = read_line.split.map(&.to_i64)
puts a.sum + c.sum + Array.new(n) { |i| b[i] - c[i] }.sort.last(k).sum