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

int countRegexSmatch(const string str, const string pattern) {
  regex pt(pattern);
  smatch mt;
  auto start = str.cbegin();
  vector<string> v;
  while (regex_search(start, str.cend(), mt, pt)) {
    v.emplace_back(mt.str());
    start = mt[0].second;
  }
  return v.size();
}

int countRegexIterator(const string str, const string pattern) {
  vector<string> v;
  regex pt(pattern);
  std::sregex_iterator end, it{str.begin(), str.end(), pt};
  for (; it != end; ++it) {
    v.emplace_back(it->str());
  }
  return v.size();
}

int solve() {
  string s;
  cin >> s;
  string p = "(mi-*n)";
  return countRegexSmatch(s, p);
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << solve() << endl;
  getchar();
}

// mi--nminminminmi-------n
// 5

// C++ 正規表現で検索文字列の抽出／出現位置の判定【match_results／std::regex】
// https://marycore.jp/prog/cpp/std-regex-match-results-match-count/