#include<fstream>
using namespace std;
ifstream cin("coffee.in");
ofstream cout("coffee.out");
int s[200001],d[200001],a,b,n,k,q,ans,t;
int main()
{
	cin>>n>>k>>q;
	for(int i=1;i<=200000;i++)s[i]=0;
	for(int i=1;i<=n;i++)
	{
		cin>>a>>b;
		s[a]=s[a]+1;
		d[b]=d[b]-1;
	}
	for(int i=1;i<=200000;i++)
	{
		if(s[i]>0)t=t+s[i];
		s[i]=t;
		if(d[i]<0)t=t+d[i];
	}
	for(int i=1;i<=q;i++)
	{
		ans=0;
		cin>>a>>b;
		for(int j=a;j<=b;j++)
		{
			if(s[j]>=k)ans++;
		}
		cout<<ans<<endl;
	}
	cin.close();
	cout.close();
	return 0;
}