std::ios::sync_with_stdio(false);

int num_lines_on_page, num_symbols_in_line, num_words;

std::cin >> num_lines_on_page >> num_symbols_in_line >> num_words;

int total_lines = 0;

int used_symbols_in_current_line = 0;

std::string word;

for(int i = 0; i < num_words; i++) {

std::cin >> word;

int word_len = static_cast<int>(word.length());

if (used_symbols_in_current_line == 0) {

total_lines++;

used_symbols_in_current_line += word_len;

} else if (used_symbols_in_current_line + 1 + word_len <= num_symbols_in_line) {

used_symbols_in_current_line += 1 + word_len;

} else {

total_lines++;

used_symbols_in_current_line = word_len;

}

}

int total_pages = (total_lines + num_lines_on_page - 1) / num_lines_on_page;

std::cout << total_pages;

return 0;