#include <bits/stdc++.h>
#define ll long long
#define _F "HCN"
using namespace std;
const ll MOD = 998244353;
ll a[100005];
int main() {
int n , q;
cin >> n >> q;
int a[n] , b[n] , c[n];
for (int i = 0 ; i < n ; i++){
cin >> a[i] >> b[i];
c[i] = a[i];
}
while(q--){
int t;
cin >> t;
for (int i = 0 ; i < n ; i++){
if (c[i] <= t){
if (c[i] == a[i]) c[i] = b[i];
else c[i] = a[i];
}
}
}
int tong = 0;
for (int i = 0 ; i < n ; i++) tong += c[i];
cout << tong;
}
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