B

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define F first
#define S second

signed main()
{

    int t , n;
    string s;
    int ans = 0;
    cin >> t;
    while(t--){
        cin >> s;
        map<char , int> cnt;
        for(int i = 0; i < s.size(); i++){
            cnt[s[i]]++;
        }
        int x = 0;
        for(char i = 'a'; i <= 'z'; i++){
            if(cnt[i] % 2 == 0)
                x++;
        }
        if(x == 26)
            ans++;
    }
    cout << ans << '\n';

    // birinci + ikinci
    // 1 sayi + 0
    // 0 sayi + 1
}


/*
4 2 1 3

*/