# ZeroJudge - g308: pB. 跳跳布朗尼(Brownie)
### 題目連結：https://zerojudge.tw/ShowProblem?problemid=g308
###### tags: `ZeroJudge` `模擬`

#include <iostream>
using namespace std;

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

int main() {
	bool brownie[1000];
	int slots, target, jumpto, teleports[1000], eats;
	while (cin >> slots >> target) {
		eats = 0;
		for (int i = 0; i < slots; ++i)
			cin >> teleports[i];
		for (int i = 0; i < slots; ++i)
			cin >> brownie[i];
		do {
			if (brownie[target])
				++eats;
			jumpto = teleports[target];
			teleports[target] = -1;
			target = jumpto;
		} while (teleports[target] != -1);
		cout << eats << '\n';
	}
}