#include <iostream>
#include <vector>
#include <algorithm>
#include <fstream>

const int FIELD_SIZE = 16;

int main() {

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

    int count, result = 0;

    fin >> count;

    count *= 2;

    char ch;

    std::vector<int> vec(9);

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

    for (int i = 0; i < 9; i++) {
        if (vec[i] > 0 && vec[i] <= count) {
            result++;
        }
    }
    std::cout << result;
}