#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
vector < pair <int, int> > v;
int main(){
	ifstream IN("input.txt");
	ofstream OUT("output.txt");
	int x, y, N;
	IN >> N;
	for(int i=0; i<N; i++){
		IN >> x >> y;
		v.push_back(make_pair(x, y));
	}
	sort(v.begin(), v.end());
	int conta = 0;
	for(int i=0; i<v.size(); i++){
		conta++;
		for(int j=0; j<i; j++){
			if(v[j].second > v[i].first){
				conta++;
			}
		}
	}
	OUT << conta;
}