#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef pair<ll, ll> p_ll;

template<class T>
void debug(T itr1, T itr2) { auto now = itr1; while(now<itr2) { cout << *now << " "; now++; } cout << endl; }
#define repr(i,from,to) for (int i=(int)from; i<(int)to; i++)
#define all(vec) vec.begin(), vec.end()
#define rep(i,N) repr(i,0,N)
#define per(i,N) for (int i=(int)N-1; i>=0; i--)

const ll MOD = pow(10,9)+7;
const ll LLINF = pow(2,61)-1;
const int INF = pow(2,30)-1;

vector<ll> fac;
void c_fac(int x=pow(10,6)+10) { fac.resize(x,true); rep(i,x) fac[i] = i ? (fac[i-1]*i)%MOD : 1; }
ll inv(ll a, ll m=MOD) { ll b = m, x = 1, y = 0; while (b!=0) { int d = a/b; a -= b*d; swap(a,b); x -= y*d; swap(x,y); } return (x+m)%m; }
ll nck(ll n, ll k) { return fac[n]*inv(fac[k]*fac[n-k]%MOD)%MOD; }
ll gcd(ll a, ll b) { if (a<b) swap(a,b); return b==0 ? a : gcd(b, a%b); }
ll lcm(ll a, ll b) { return a/gcd(a,b)*b; }

// ----------------------------------------------------------------------
// ----------------------------------------------------------------------

struct edge { p_ll to; ll d; };
vector<vector<vector<edge>>> adj;

vector<vector<ll>> dijkstra(int n=0, int m=0) {
  int N = adj.size(), M = adj[0].size();
  auto c = [](const pair<p_ll, ll> &x, const pair<p_ll, ll> &y){return x.second>y.second;};
  priority_queue<pair<p_ll, ll>, vector<pair<p_ll, ll>>, decltype(c)> q(c);
  vector<vector<ll>> result(N,vector<ll>(M,LLINF)); result[n][m] = 0; q.push(make_pair(make_pair(n,m),0));
  while(q.size()) {
    pair<p_ll, ll> now = q.top(); q.pop();
    p_ll np = now.first;
    ll np1 = np.first, np2 = np.second;
    ll nd = now.second;
    if (nd>result[np1][np2]) continue;
    for (auto x: adj[np1][np2]) {
      ll xt1 = x.to.first, xt2 = x.to.second;
      if (result[xt1][xt2]<=result[np1][np2]+x.d) continue;
      q.push(make_pair(make_pair(xt1, xt2), result[np1][np2]+x.d));
      result[xt1][xt2] = result[np1][np2]+x.d;
    }
  }
  return result;
}

// ----------------------------------------------------------------------
// ----------------------------------------------------------------------

int main() {
  int N, C, V; cin >> N >> C >> V;
  int S[V]; rep(i,V) { cin >> S[i]; S[i]--; }
  int T[V]; rep(i,V) { cin >> T[i]; T[i]--; }
  int Y[V]; rep(i,V) cin >> Y[i];
  int M[V]; rep(i,V) cin >> M[i];

  adj.resize(N); rep(i,N) adj[i].resize(C+1);
  rep(i,N) rep(j,C) adj[i][j].push_back({make_pair(i,j+1),0});
  rep(i,V) {
    rep(j,C+1-Y[i]) {
      adj[S[i]][j].push_back({make_pair(T[i],j+Y[i]),M[i]});
      // adj[T[i]][j].push_back({make_pair(S[i],j+Y[i]),M[i]});
    }
  }
  vector<vector<ll>> d = dijkstra();
  ll result = d[N-1][C];
  if (result==LLINF) result = -1;
  cout << result << endl;
  return 0;
}