N=gets.to_i
I = $<.read.split("\n").map{|m|m.split(" ").map{|n|n.to_i}}
m=Array.new(N+1).map{Array.new(0)}
m[0].push([0,0])

for x in 1..N do
  m[x-1].each do |p|
    pa = p[0]
    pb = p[1]
    ca = I[x-1][0]
    cb = I[x-1][1]
    #puts "pa:#{pa}\tpb:#{pb}\tca:#{ca}\tcb:#{cb}"
    m[x].push [pa+ca, pb]
    m[x].push [pa, pb+cb]
  end

  m[x].sort_by!{|a|[a[0],a[1]].max}
  m[x] = m[x].slice(0..10)
end

puts [m[N][0][0], m[N][0][1]].max