#include <bits/stdc++.h>
using namespace std;
int a[200005];
int b[200005];
bool cur[200005];
int main(){
int n,k;
cin>>n>>k;
for (int i=1;i<=n;i++) cin>>a[i]>>b[i];
while (k--){
int num;
cin>>num;
for (int i=1;i<=n;i++){
if (cur[i]&&b[i]<=num) cur[i]=0;
else if (!cur[i]&&a[i]<=num) cur[i]=1;
}
}
int ans=0;
for (int i=1;i<=n;i++){
if (cur[i]) ans+=b[i];
else ans+=a[i];
}
cout<<ans;
}
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