//https://oj.uz/problem/view/JOI14_fortune_telling2
#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define FOD(i, a, b) for (int i = (a); i >= (b); --i)
#define fi first
#define se second
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int mod = 7 + 1e9;
const int maxn = 5 + 2e5;
int n, m, q, a[maxn], b[maxn], k[maxn];
int bit[maxn], t[maxn << 2];
vector<int> c;
struct SegmentTree {
vector<int> T;
SegmentTree(int n) {
T.resize(4 * n + 1);
}
void update(int s, int l, int r, int x, int v) {
if (l == r) {
T[s] = v;
return;
}
int mid = (l + r) >> 1;
if (x <= mid) update(s << 1, l, mid, x, v);
else update(s << 1 | 1, mid + 1, r, x, v);
T[s] = max(T[s << 1], T[s << 1 | 1]);
}
int get(int s, int l, int r, int u, int v) {
if (l > v || r < u || u > v) return 0;
if (l >= u && r <= v) return T[s];
int mid = (l + r) >> 1;
return max(get(s << 1, l, mid, u, v), get(s << 1 | 1, mid + 1, r, u, v));
}
};
void up(int x) {
for (; x; x -= x & -x) ++bit[x];
}
int calc(int x) {
int res = 0;
for (; x < maxn; x += x & -x) res += bit[x];
return res;
}
// void up(int id) {
// for (; id; id -= id & -id) ++bit[id];
// }
// int calc(int id) {
// int res = 0;
// for (; id <= m; id += id & -id) res += bit[id];
// return res;
// }
signed main() {
#define name "task"
if (fopen(name".inp", "r")) {
freopen(name".inp", "r", stdin);
freopen(name".out", "w", stdout);
}
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n >> q;
vector<pair<int, int>> qq;
for (int i = 1; i <= n; ++i) {
cin >> a[i] >> b[i];
c.push_back(a[i]);
c.push_back(b[i]);
}
for (int i = 1; i <= q; ++i) {
cin >> k[i];
qq.emplace_back(k[i], i);
c.push_back(k[i]);
}
sort(c.begin(), c.end());
c.resize(unique(c.begin(), c.end()) - c.begin());
m = c.size();
SegmentTree it(m);
for (auto &[x, id]: qq) {
it.update(1, 1, m, upper_bound(c.begin(), c.end(), x) - c.begin(), id);
}
vector<tuple<int, int, int>> qr;
for (int i = 1; i <= n; ++i) {
int u = upper_bound(c.begin(), c.end(), a[i]) - c.begin();
int v = upper_bound(c.begin(), c.end(), b[i]) - c.begin();
if (u > v) swap(u, v);
qr.emplace_back(it.get(1, 1, m, u, v - 1), max(a[i], b[i]), i);
}
sort(qr.begin(), qr.end());
reverse(qq.begin(), qq.end());
for (auto &[x, id]: qq) {
up(upper_bound(c.begin(), c.end(), x) - c.begin());
while(qr.size() && get<0>(qr.back()) == id) {
auto [_, val, i] = qr.back(); qr.pop_back();
int cnt = calc(upper_bound(c.begin(), c.end(), val) - c.begin());
if (cnt & 1) {
if (a[i] > b[i]) swap(a[i], b[i]);
}
else {
if (a[i] < b[i]) swap(a[i], b[i]);
}
}
}
while (qr.size()) {
auto [_, val, i] = qr.back(); qr.pop_back();
int cnt = calc(upper_bound(c.begin(), c.end(), val) - c.begin());
if (cnt & 1) swap(a[i], b[i]);
}
ll res = 0;
for (int i = 1; i <= n; ++i) res += a[i];
cout << res;
return 0;
}
