#include <bits/stdc++.h>
using namespace std;
#define INF 1e9
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define rep(i,b) FOR(i,0,b)
#define int long long
int N,C,V;

int dp[51][310];
signed main(){
  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, 51)rep(j, 301) dp[i][j] = INF;
  //rep(i,310)dp[1][i]=0;
  dp[1][C]=0;

  for(int i=1;i<=N;i++){
    for(int j=0;j<=C;j++){
      for(int k=0;k<V;k++){
        if(dp[i][j]!=INF){
          //道があるか
            if(i==S[k]&&j-Y[k]>=0){
                dp[T[k]][j-Y[k]]=min(dp[i][j]+M[k],dp[T[k]][j-Y[k]]);
            }
        }

      }

    }
  }




  int ans=INF;
  rep(i,301)ans=min(ans,dp[N][i]);
  if(ans<INF)cout<<ans<<endl;
  else cout<<-1<<endl;


  return 0;
}