#include <iostream>
#include <iterator>
#include <cstdlib>
#include <sstream> 
#include <string> 
#include <vector>
#include <algorithm>

static const int MAX_RESULT = 10000000;

struct MoveInfo
{
	int max_town_no_;
	int max_money_;
	std::vector<int> start_city_;
	std::vector<int> end_city_;
	std::vector<int> cost_;
	std::vector<int> time_;
	int result_;

	MoveInfo()
	: max_town_no_(-1)
	, max_money_(0)
	, result_(MAX_RESULT)
	{}
};

void calc_optimal_root(MoveInfo& info)
{
	int start_city = 1;
	int running_cost = 0;
	int running_time = 0;

	auto f_check_end = [](int cost, int time, MoveInfo& info) {
		if (cost <= info.max_money_) {
            //std::cout << "[SET-01]:" << cost << std::endl;
			if (time < info.result_) {
				info.result_ = time;
			}
		}
	};
	while(1) {
		const bool is_erase = (start_city == 1);
		auto sIter = std::find(info.start_city_.begin() ,info.start_city_.end(), start_city);
		if (sIter == info.start_city_.end()) {
			if (is_erase) {
                //std::cout << "[EXIT]:" << start_city << std::endl;
				break;
			}
			// 道が途絶えている場合
			else {
                //std::cout << "[ERROR]:" << start_city << std::endl; 
				start_city   = 1;
				running_cost = 0;
				running_time = 0;
				continue;
			}
		}

		size_t index = std::distance(info.start_city_.begin(), sIter);
		if (index < info.end_city_.size()) {
			start_city = info.end_city_[index];
            //std::cout << "[INDEX]:" << index << " [NEXT]:" << start_city << std::endl; 
		}
		if (index < info.cost_.size()) {
			running_cost += info.cost_[index];
		}
		if (index < info.time_.size()) {
			running_time += info.time_[index];
		}
		if (start_city == info.max_town_no_) {
            //std::cout << "[COST]:" << running_cost << " [TIME]:" << running_time << std::endl; 
			f_check_end(running_cost, running_time, info);
			start_city   = 1;
			running_cost = 0;
			running_time = 0;
		}
		if (is_erase) {
			info.start_city_.erase(info.start_city_.begin() + index);
			info.end_city_.erase(info.end_city_.begin() + index);
			info.cost_.erase(info.cost_.begin() + index);
			info.time_.erase(info.time_.begin() + index);
		}
	}

    std::cout << ((info.result_== MAX_RESULT) ? -1 : info.result_) << std::endl;
}

int main()
{
	std::string line;
	int input_count = 0;
	MoveInfo info;
	for (;std::getline(std::cin, line);) {
		std::istringstream iss(line);
		switch(input_count) {
		case 0:	// 町の数
			iss >> info.max_town_no_;
			break;
		case 1:	// 手持ち金額
			iss >> info.max_money_;
			break;
		case 3:	// 開始町
			std::copy(std::istream_iterator<int>(iss), {}, std::back_inserter(info.start_city_));
			break;
		case 4:	// 終点町
			std::copy(std::istream_iterator<int>(iss), {}, std::back_inserter(info.end_city_));
			break;
		case 5:	// コスト
			std::copy(std::istream_iterator<int>(iss), {}, std::back_inserter(info.cost_));
			break;
		case 6:	// 単位時間
			std::copy(std::istream_iterator<int>(iss), {}, std::back_inserter(info.time_));
			break;
		}
		++input_count;
		if (7<=input_count) {
			break;
		}
	}

	calc_optimal_root(info);

	return 0;
}