#include "bits/stdc++.h"

#define int long long

using namespace std;
using ll = long long;
using P = pair<ll, ll>;
const ll INF = (1LL << 61);
ll mod = 998244353;


void solve() {
	int N, M, X; cin >> N >> M >> X;
	vector<int>A(N), B(N);
	vector<vector<int>>t(M);
	for (int i = 0; i < N; i++) {
		cin >> A[i] >> B[i]; B[i]--;
		t[B[i]].push_back(A[i]);
	}
	for (int i = 0; i < M; i++)sort(t[i].rbegin(), t[i].rend());
	vector<int>V;
	for (int i = 0; i < M; i++) {
		int now = 0;
		for (auto x : t[i]) {
			if (now == 0)V.push_back(x + X);
			else V.push_back(x);
			now++;
		}
	}
	sort(V.rbegin(), V.rend());
	vector<int>sum(N + 1);
	for (int i = 0; i < N; i++)sum[i + 1] = sum[i] + V[i];
	int K; cin >> K;
	int ans = 0;
	for (int i = 0; i < K; i++) {
		int C; cin >> C;
		ans += sum[C];
	}
	cout << ans << endl;
}
signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	solve();
	return 0;

}