#include <bits/stdc++.h>
using namespace std;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int n, m; cin >> n >> m;
vector<pair<int, int>> x(n);
for(int i = 0; i < n; i++){
cin >> x[i].second >> x[i].first;
}
vector<int> c(m);
for(int i = 0; i < m; i++){
cin >> c[i];
}
sort(c.begin(), c.end());
sort(x.rbegin(), x.rend());
int it = m-1;
for(int i = 0; i < n; i++){
int j = x[i].second;
if(c[it] >= j){
it--;
}
if(it == -1) break;
}
cout << m-it-1 << "\n";
return 0;
}
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