/**                                                                   
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 *                        ..,:::;;;;:::,,.                            
 */
#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
using namespace std;
int n,m,q,from,to,qr,ql,ans;
vector<int> l[508];
int main()
{
	scanf("%d %d %d",&n,&m,&q);
	for(int i=1;i<=m;i++)
	{
		scanf("%d %d",&from,&to);
		l[from].push_back(to);
	}
	for(int i=1;i<=n;i++)
		if(l[i].size()!=0)
			sort(l[i].begin(),l[i].end());
	for(int i=1;i<=q;i++)
	{
		scanf("%d %d",&ql,&qr);
		ans=0;
		for(int k=ql;k<=qr;k++)
			ans+=upper_bound(l[k].begin(),l[k].end(),qr)-l[k].begin();
		printf("%d\n",ans);
	}
	return 0;
}
/**                                                                         
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 *                         .,::iiirsssssssssrri;;:.                     
 */

Measured memory_bytes: 2176