N = gets.to_i
A = Array.new(3)
B = Array.new(3)
(0..2).each do |i|
  A[i], B[i] = gets.split.map(&:to_i)
end
N2 = A[0]*A[1]*A[2]
loop = [0,N.div(N2)-2].max
ans = [B[0]*A[1]*A[2],A[0]*B[1]*A[2],A[0]*A[1]*B[2]].max * loop
N -= loop * N2

dp = Array.new(N+1, 0)

(0..N).each do |i|
  (0..2).each do |j|
    dp[i+A[j]] = [dp[i+A[j]], dp[i]+B[j]].max if i+A[j] <= N
  end
end
puts (ans+dp[N])