n = gets.to_i - 1
c = gets.to_i 
v = gets.to_i
s = gets.split.map{|s| s.to_i - 1 }
t = gets.split.map{|s| s.to_i - 1 }
y = gets.split.map(&:to_i) # コスト
m = gets.split.map(&:to_i) # 時間

d = Hash.new do |h1, k1|
  h1[k1] = Hash.new{|h2, k2| h2[k2] = []}
end
v.times do |i|
  d[s[i]][t[i]] = d[t[i]][s[i]] = [y[i], m[i]]
end

# dp[現在地点][コスト] = 時間 
dp = Array.new(n + 1){ Array.new(c + 1, Float::INFINITY) }
dp[0][0] = 0

[*0..(n + 1)].product([*0..(c + 1)]) do |current, amount|
  d[current].each do |nxt, (cost, hour)|
    if amount + cost <= c
      dp[nxt][amount + cost] = [dp[nxt][amount + cost], dp[current][amount] + hour].min
    end
  end
end

ans = dp[n].min
puts (ans == Float::INFINITY) ? -1 : ans