#include <bits/stdc++.h>
using namespace std;
void setup()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
}
int n, k, t, a[1000], b[1000];
long long res = 0;
int main()
{
setup();
cin >> n >> k;
for (int i = 0; i < n; ++i)
{
cin >> a[i] >> b[i];
}
while (k--)
{
cin >> t;
for (int i = 0; i < n; ++i)
{
if (a[i] <= t)
{
swap(a[i], b[i]);
}
}
}
for (int i = 0; i < n; ++i)
{
res += a[i];
}
cout << res;
return 0;
}
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