#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,C,V; cin >> N >> C >> V;
    vector<int> S(V),T(V),Y(V),M(V);
    for(auto &a : S) cin >> a,a--;
    for(auto &a : T) cin >> a,a--;
    for(auto &a : Y) cin >> a;
    for(auto &a : M) cin >> a;

    vector<vector<tuple<int,int,int>>> edge(N);
    for(int i=0; i<V; i++) edge.at(S.at(i)).push_back({T.at(i),Y.at(i),M.at(i)});

    int inf = 2e9;
    vector<vector<int>> dp(N,vector<int>(C+1,inf));
    dp.at(0).at(C) = 0;
    for(int i=0; i<N; i++) for(int k=1; k<=C; k++){
        if(dp.at(i).at(k) == inf) continue;
        for(auto [to,cost,time] : edge.at(i)){
            if(k < cost) continue;
            dp.at(to).at(k-cost) = min(dp.at(to).at(k-cost),dp.at(i).at(k)+time);
        }
    } 
    int mint = *min_element(dp.at(N-1).begin(),dp.at(N-1).end());
    if(mint == inf) mint = -1;
    cout << mint << endl;
}