```#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N = 2e5 + 9;
map<int,int>mp1;
map<pair<int,int>,int>mp2;
vector<pair<int,int>> a[N];
signed main(){
	int n;cin>>n;
	for(int i=1;i<=n;i++){
		int m;cin>>m;
		for(int j=1;j<=m;j++){
			int x,y;
			cin>>x>>y;
			a[i].push_back({x,y});
			mp1[x] = max(mp1[x],y);
			mp2[{x,y}]++;
		}
	}
	int res = 0,f1 = 1;
	for(int i = 1;i <=n;i++){
		int f = 0;
		for(int j = 0;j < a[i].size();j++){
			if(mp2[a[i][j]]==1 && mp1[a[i][j].first] == a[i][j].second){
				f = 1;
			}
		}
		if(f == 1) res++;
		else{
			res += f1;
			f1 = 0;
		}
		
	}
	cout<<res;
	return 0;
}