#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < n; ++i)
using ll = long long;
const int INF=1e9;
struct edge{int end,cost,time;};
vector<vector<edge>>G(50);
int ans=INF;
int n,c,v;
void dfs(int v,int c,int t){
   if(v==n-1)ans=min(ans,t);
   for (auto &&i : G[v]){
      if(c<i.cost)continue;
      dfs(i.end,c-i.cost,t+i.time);
   }
}
int main() {
   ios::sync_with_stdio(false);
   cin.tie(0);
   cin>>n>>c>>v;
   vector<int>S(v),T(v),Y(v),M(v);
   rep(i,v)cin>>S[i];
   rep(i,v)cin>>T[i];
   rep(i,v)cin>>Y[i];
   rep(i,v)cin>>M[i];
   rep(i,v){
      edge e;
      e.end=T[i]-1;e.cost=Y[i];e.time=M[i];
      G[S[i]-1].push_back(e);
   }
   dfs(0,c,0);
   if(ans==INF)cout<<-1<<endl;
   else cout<<ans<<endl;
}