#include <bits/stdc++.h> using namespace std; #define int long long class mst { int n; vector <vector <int>> tree; void build(int num, int l, int r, vector <int> &val) { if (l == r - 1) { tree[num].push_back(val[l]); return; } int med = (l + r) / 2; build(2 * num + 1, l, med, val); build(2 * num + 2, med, r, val); merge(tree[2 * num + 1].begin(), tree[2 * num + 1].end(), tree[2 * num + 2].begin(), tree[2 * num + 2].end(), back_inserter(tree[num])); } int get(int num, int l, int r, int low, int high, int v) { if (l >= low && r <= high) { return r - l - (int)(lower_bound(tree[num].begin(), tree[num].end(), v) - tree[num].begin()); } int med = (l + r) / 2; int ans = 0; if (med > low) { ans += get(2 * num + 1, l, med, low, high, v); } if (med < high) { ans += get(2 * num + 2, med, r, low, high, v); } return ans; } int get_ind(int num, int l, int r, int low, int high) { if (l == r - 1) { if (tree[num].front() >= low && tree[num].front() < high) { return l; } return l - 1; } int med = (l + r) / 2; if (lower_bound(tree[2 * num + 2].begin(), tree[2 * num + 2].end(), high) - lower_bound( tree[2 * num + 2].begin(), tree[2 * num + 2].end(), low) > 0) { return get_ind(2 * num + 2, med, r, low, high); } else { return get_ind(2 * num + 1, l, med, low, high); } } public: void init(int nn, vector <int> &val) { n = nn; tree.resize(4 * n); build(0, 0, n, val); } int get(int l, int r, int v) { if (l >= r) { return 0; } return get(0, 0, n, l, r, v); } int get_ind(int mn, int mx) { return get_ind(0, 0, n, mn, mx); } }; void init(vector <int> &val) { for (auto &v : val) { cin >> v; } } void solve() { int n; cin >> n; int k; cin >> k; vector <int> a(n), b(n), c(k); for (int i = 0; i < n; ++i) { cin >> a[i] >> b[i]; } init(c); mst now; now.init(k, c); int ans = 0; for (int i = 0; i < n; ++i) { int ind = now.get_ind(min(a[i], b[i]), max(a[i], b[i])); if (ind == - 1) { int cur = now.get(0, k, max(a[i], b[i])); if (cur & 1) { ans += b[i]; } else { ans += a[i]; } } else { if (a[i] < b[i]) { swap(a[i], b[i]); } int cur = now.get(ind, k, a[i]); if (cur & 1) { ans += b[i]; } else { ans += a[i]; } } } cout << ans << '\n'; } signed main() { cin.tie(0); ios::sync_with_stdio(false); solve(); }