rt

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll N=2e5+5;
int a[N];
int b[N];
int main(){
	int n,m,choc=0;
	cin>>n>>m;
	int k;
	cin>>k;
	for(int i=1;i<=k;i++){
		cin>>a[i]>>b[i];
		if(a[i]>=b[i])	choc++;
	}
	cout<<choc;
	return 0;
}