#include <iostream>
#include <vector>
#include <fstream>
#include <map>

const int FIELD_SIZE = 16;

int main() {

    std::ifstream fin("input.txt");

    int index[9]{};

    int k, result = 0;

    char temp;

    fin >> k;

    for (int i = 0; i < FIELD_SIZE; i++) {
        fin >> temp;
        if (temp != '.') {
            index[temp - '1']++;
        }
    }

    for (int i = 0; i < 9; i++) {
        if (index[i] > 0 && index[i] <= k * 2) {
            result++;
        }
    }

    std::cout << result;
}