#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
using namespace std;

int main(){

  string s;
  cin >> s;

  s += " ";

  int cnt = 0;
  bool fl = false;
  for(int i=0; i<s.size(); i++){
    if( s[i] == '-' ) continue;
    if( s[i] == 'm' && s[i+1] == 'i' ) fl = true;

    if( s[i] == 'n' && fl ){
      cnt++;
      fl = false;
    }
  }
  cout << cnt << endl;

  return 0;
}