// URL: https://yukicoder.me/problems/no/1

import std.algorithm, std.container, std.math, std.range, std.typecons, std.string;

version(unittest) {} else
void main()
{
  int N; io.getV(N);
  int C; io.getV(C);
  int V; io.getV(V);
  int[] S; io.getA(V, S); --S[];
  int[] T; io.getA(V, T); --T[];
  int[] Y; io.getA(V, Y);
  int[] M; io.getA(V, M);

  struct E { int v, y, m; }
  E[][int] g;
  foreach (Si, Ti, Yi, Mi; lockstep(S, T, Y, M)) {
    g[Si] ~= E(Ti, Yi, Mi);
    g[Ti] ~= E(Si, Yi, Mi);
  }

  auto dp = new int[][](N, C+1), inf = 10^^9;
  foreach (dpi; dp) dpi[] = inf;
  dp[0][0] = 0;

  struct R { int u, c; }
  auto q = DList!R(R(0, 0));
  while (!q.empty) {
    auto r = q.front; q.removeFront();
    foreach (e; g[r.u]) {
      auto c = r.c+e.y, m = dp[r.u][r.c]+e.m;
      if (c <= C && m < dp[e.v][c]) {
	dp[e.v][c] = m;
	q.insertBack(R(e.v, c));
      }
    }
  }

  io.putB(dp[N-1].minElement < inf, dp[N-1].minElement, -1);
}

auto io = IO!()();

import std.stdio;
struct IO(alias IN = stdin, alias OUT = stdout, string delimiter = " ", string floatFormat = "%.10f")
{
  import std.algorithm, std.conv, std.format, std.meta, std.range, std.stdio, std.traits;
  alias assignable = hasAssignableElements;

  dchar[] buf;
  auto sp = (new dchar[](0)).splitter;
  void nextLine() { IN.readln(buf); sp = buf.splitter; }

  auto get(T)(ref T v) { if (sp.empty) nextLine(); v = sp.front.to!T; sp.popFront(); }
  auto getV(T...)(ref T v) { foreach (ref w; v) get(w); }
  auto getA(T)(size_t n, ref T v) if (assignable!T) { v = new T(n); foreach (ref w; v) get(w); }
  auto getC(T...)(size_t n, ref T v) if (allSatisfy!(assignable, T))
  {
    foreach (ref w; v) w = new typeof(w)(n);
    foreach (i; 0..n) foreach (ref w; v) get(w[i]);
  }
  auto getM(T)(size_t r, size_t c, ref T v) if (assignable!T && assignable!(ElementType!T))
  {
    v = new T(r); foreach (ref w; v) getA(c, w);
  }

  auto putR(T)(T v)
  {
    auto w = v;
    while (!w.empty) {
      putA(w.front); w.popFront();
      if (!w.empty) OUT.write(delimiter);
    }
  }
  auto putA(T)(T v)
  {
    static if (isInputRange!T && !isSomeString!T) putR(v);
    else if (isFloatingPoint!T) OUT.write(format(floatFormat, v));
    else OUT.write(v);
  }
  auto put(T...)(T v)
  {
    foreach (i, w; v) { putA(w); if (i < v.length-1) OUT.write(delimiter); }
    OUT.writeln;
  }

  auto putB(S, T)(bool c, S t, T f) { if (c) put(t); else put(f); }
  auto putRaw(T...)(T v) { OUT.write(v); OUT.writeln; }
}