#include<bits/stdc++.h>
using namespace std;  
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define rep(i,n) for(ll i=0;i<(n);i++)  
#define pii pair<int,int>
#define piii pair<int,pii>
#define mp make_pair
#define pb push_back  
#define ALL(a) (a).begin(),(a).end()
#define FST first
#define SEC second  
const int INF = (INT_MAX/2);
const ll LLINF = (LLONG_MAX/2);
const double eps = 1e-5;
const double PI = M_PI;  
#define DEB cout<<"!"<<endl
#define SHOW(a,b) cout<<(a)<<" "<<(b)<<endl
#define SHOWARRAY(ar,i,j) REP(a,i)REP(b,j)cout<<ar[a][b]<<((b==j-1)?((a==i-1)?("\n\n"):("\n")):(" "))
  
#define DIV 1000000007
typedef vector<ll> Array;
typedef vector<Array> matrix;

int dp[51][301] ={}; // dp[N][C] = time

struct edge{
  int to,cost,time;
};

vector<edge> G[51];

int main(){
  int n,c,v; cin >> n>> c >> v;
  vi 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)
    G[s[i]].pb((edge){t[i],y[i],m[i]});

    fill_n(dp[0],51*301,INF);
  
  priority_queue<pii,vector<pii>,greater<pii > > q; //cost,position
  dp[1][c] = 0;
  q.push(mp(c,1));
  while(!q.empty()){
    int id = q.top().SEC;
    int nowc = q.top().FST;
    q.pop();
    for(int i = 0; i < G[id].size();i++){
      if(nowc-G[id][i].cost>=0 && dp[id][nowc]+G[id][i].time < dp[G[id][i].to][nowc-G[id][i].cost]){
        dp[G[id][i].to][nowc-G[id][i].cost]=dp[id][nowc]+G[id][i].time;
        q.push(mp(nowc-G[id][i].cost,G[id][i].to));
      }
    }
  }
  int ans = INF;
  for(int i = 0; i <= 301; i++)
    ans = min(ans,dp[n][i]);
  cout << ((ans == INF)? -1 : ans) << endl;
}