#include <iostream>
#include <string>

using namespace std;

int main() {
  string s, ans;
  int cnt=0;
  cin >> s;

  for (auto &c:s) {
    if (c!='-') {
      ans+=c;
    }
  }

  for (int i=0; i<ans.size(); i++) {
    if (ans[i]=='m' && ans[i+1]=='i' && ans[i+2]=='n') cnt++;
  }

  printf("%d\n", cnt);
  return 0;
}