#include <stdio.h>
#include <vector>
#include <algorithm>

std::vector<int> V[200010],save;
long long int sum[200010];
int main()
{
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	
	for(int i=1;i<=a;i++)
	{
		int d,e;
		scanf("%d%d",&d,&e);
		V[e].push_back(d);
	}
	
	for(int i=1;i<=b;i++) std::sort(V[i].begin(),V[i].end());
	
	for(int i=1;i<=b;i++)
	{
		if(V[i].size()>=1)
		{
			std::reverse(V[i].begin(),V[i].end());
			save.push_back(V[i][0]+c);
			for(int j=1;j<V[i].size();j++) save.push_back(V[i][j]);
		}
	}
	
	std::sort(save.begin(),save.end());
	std::reverse(save.begin(),save.end());
	
	for(int i=0;i<save.size();i++) sum[i+1] = sum[i] + save[i];
	
	int d;
	scanf("%d",&d);
	long long int ans = 0;
	for(int i=1;i<=d;i++)
	{
		int e;
		scanf("%d",&e);
		ans += sum[e];
	}
	printf("%lld",ans);
}