#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define MP(a,b) make_pair(a,b)
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, s, m;
	cin >> n >> s >> m;
	vector<int> moves(m);
	for (int i = 0; i < m; ++i) {
		cin >> moves[i];
	}
	vector<vector<long long>> p(n + 1);
	for (int i = 1; i <= n; ++i) {
		int t_i;
		cin >> t_i;
		p[i].resize(t_i);
		for (int j = 0; j < t_i; ++j) {
			cin >> p[i][j];
		}
	}
	vector<int> cnt(n + 1, 0);
	long long ans = 0;
	int pos = s;
	cnt[pos]++;
	if (cnt[pos] <= p[pos].size()) {
		ans += p[pos][cnt[pos] - 1];
	}
	for (int move : moves) {
		if (move == 1) {
			pos++;
			if (pos > n) pos = 1;
		} else { 
			pos--;
			if (pos < 1) pos = n;
		}
		cnt[pos]++;
		if (cnt[pos] <= p[pos].size()) {
			ans += p[pos][cnt[pos] - 1];
		}
	}
	cout << ans << endl;

	return 0;
}