#include<bits/stdc++.h>
using namespace std;
#define int long long
int n, m, ans, x, y;
vector<int> c;
vector<pair<int, int>> v;
signed main() {
cin >> n >> m;
for (int i = 1; i <= n; i++) {
cin >> x >> y;
v.push_back({x, y});
}
for (int i = 1; i <= n; i++) {
cin >> x; c.push_back(x);
}
sort(v.begin(), v.end()); sort(c.begin(), c.end());
for (int i = n - 1; i >= 0; i--) {
if (ans == m) break;
if (c[m - ans - 1] >= v[i].second) ans++;
}
cout << ans << "\n";
}
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