#include <bits/stdc++.h>
#define int long long
#define pb push_back
using namespace std;
const int N=2e5+10;
const int inf=5e18;
const int mod=1e9+7;
pair<int,int>a[N];
int c[N];
signed main() {
ios_base::sync_with_stdio(NULL);
cin.tie(NULL);
int T=1;
// cin>>T;
while(T--) {
int n,m;
cin>>n>>m;
for(int i=1;i<=n;i++) {
cin>>a[i].second>>a[i].first;
}
sort(a+1,a+n+1);
for(int i=1;i<=m;i++) cin>>c[i];
sort(c+1,c+m+1);
int ans=0;
for(int i=1,j=1;i<=n && j<=m;j++,i++) {
if(a[i].second>c[j]) ans++;
}
cout<<ans<<"\n";
}
}
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