#include <iostream>
#include <algorithm>
using namespace std;
 
int main()
{   int resultat =0;
 
    int n;
    cin>>n;
    for (int i=n;i>0;i--){
    string s;
    cin>>s;
    string s1;
    cin>> s1;
    sort(s.begin(),s.end());
    sort(s1.begin(),s1.end());
    if(s==s1){
        resultat++;
    }
    }
   cout<< resultat <<endl;
}