function main(line) {
  const n = Number(line.shift());
  const c = Number(line.shift());
  const v = Number(line.shift());
  const s = line.shift().split(" ").map(x=>Number(x)-1);
  const t = line.shift().split(" ").map(x=>Number(x)-1);
  const y = line.shift().split(" ").map(x=>Number(x));
  const m = line.shift().split(" ").map(x=>Number(x));
  const arr = [];
  for(let i=0; i<v; i++) {
    arr.push({s:s[i], t:t[i], y:y[i], m:m[i]});
  }
  const q = [{id:0, money:c, cost:0}];
  let minCost = Number.MAX_SAFE_INTEGER;
  while(q.length > 0) {
    const now = q.shift();
    const id = now.id;
    const money = now.money;
    const cost = now.cost;
    if(cost > minCost) continue;
    if(id === n-1) {
      if(cost < minCost) {
        minCost = cost;
      }
    }
    arr.filter(cur => cur.s === id).forEach(cur => {
      const nextMoney = money - cur.y;
      if(nextMoney >= 0) {
        const nextCost = cost + cur.m;
        q.push({id:cur.t, money:nextMoney, cost:nextCost});
      }
    });
  }
  console.log(minCost === Number.MAX_SAFE_INTEGER ? -1 : minCost);
}

main(require("fs").readFileSync("/dev/stdin", "utf8").split("\n"));