#include <iostream>
#include <vector>
int main(){
  std::vector<char> v;
  char ctemp;
  int count = 0;
  while ( std::cin >> ctemp ) v.push_back(ctemp);
  for (int i = v.size() - 1; i >= 0; i--) {
    if ( v[i] == '-' ) v.erase(v.begin() + i);
  }
  for (int i = 0; i < v.size(); i++) {
    if (v[i] == 'm' && v[i+1] == 'i' && v[i+2] == 'n') count++;
  }
  std::cout << count << std::endl;
}