#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int N, K;
cin >> N >> K;
vector<long long> A(N), B(N);
for (int i = 0; i < N; ++i) cin >> A[i] >> B[i];
vector<long long> T(K);
for (int j = 0; j < K; ++j) cin >> T[j];
sort(T.begin(), T.end());
long long ans = 0;
for (int i = 0; i < N; ++i) {
long long lo = min(A[i], B[i]);
long long hi = max(A[i], B[i]);
int cnt = upper_bound(T.begin(), T.end(), hi) -
lower_bound(T.begin(), T.end(), lo);
if (cnt % 2 == 0) ans += A[i];
else ans += B[i];
}
cout << ans << "\n";
}
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