#include <bits/stdc++.h>
using namespace std;
int binary(vector<int>&a,int key)      //By chandan date 03-04-2015
{
  int l=0,h=a.size(),cnt=0;
  while(l<=h)
  {
    int mid=l+(h-l)/2;
    if(a[mid]==key)
    cnt++;
    else if(a[mid]>h)
    l=mid+1;
    else if(a[mid]<h)
    h=mid-1;
  }
  return cnt;
}
int main() {
	// your code goes here
	int n,cnt=0;
	cin>>n;
	vector<int>a(n);
	vector<int>h(n);
	for(int i=0;i<n;i++)
	cin>>a[i],cin>>h[i];
	sort(a.begin(),a.end());
	for(int i=0;i<h.size();i++)
	 cnt+=binary(a,h[i]);
	cout<<cnt;
	return 0;
}

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NAoxMDAgNDIKNDIgMTAwCjUgNDIKMTAwIDU=

4
100 42
42 100
5 42
100 5