#include <bits/stdc++.h>
using namespace std;
pair <int, int > a[100005];
int b[100005];
int n,m;
bool cmp(pair <int, int > x,pair <int, int > y){
return x.second >y.second;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m;
for(int i=1;i<=n;i++) cin >> a[i].first >> a[i].second;
for(int i=1;i<=m;i++) cin >> b[i];
sort(a+1,a+n+1,cmp);
sort(b+1,b+m+1);
reverse(b+1,b+m+1);
int id=1;
for(int i=1;i<=n;i++){
if(a[i].first>b[id]) continue;
id++;
}
cout << min(id-1,m);
return 0;
}
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