# ZeroJudge - g420: PB.BAD question
### 題目連結：https://zerojudge.tw/ShowProblem?problemid=g420
###### tags: `ZeroJudge` `模擬`

#include <iostream>
using namespace std;

static const auto Initialize = [] {
	cin.sync_with_stdio(false); cin.tie(nullptr);
	return nullptr;
}();

int main() {
	long long health;
	static int levels, losses[1000000], gains[1000000];
	while (cin >> levels >> health) {
		for (int i = 0; i < levels; ++i)
			cin >> losses[i];
		for (int i = 0; i < levels; ++i)
			cin >> gains[i];
		for (int i = 0; i < levels; ++i) {
			if (health < losses[i]) {
				cout << i + 1 << '\n';
				health = -1;
				break;
			}
			health += gains[i] - losses[i];
		}
		if (health >= 0)
			cout << levels << '\n';
	}
}