#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <cctype>

using namespace std;

int main()
{
    int n, i, j, out;
    int abc[26] = { };
    int x = sizeof(abc);
    string text;

    cin >> n;
    out = n;
    cin.ignore();

    for (i = 0; i < n; i++)
    {
        getline(cin, text);
        memset(abc, 0, x);
        for (j = 0; j < text.length(); j++)
        {
            text[j] = tolower(text[j]);
            abc[int(text[j])-97]++;
        }
        for (j = 0; j < 26; j++)
        {
            if (abc[j] > 2)
            {
                out--;
                break;
            }
        }
    }

    cout << out;
}