#include <bits/stdc++.h>
using namespace std;
int main(){
    string s; cin >> s;
    int counter = 0;
    int rel =0;
    for(int i=0; i <= s.size(); i++){
        if(s[i] == '-'){
            continue;
        }
        if(s[i] == 'm' || s[i] == 'i' || s[i] == 'n') counter++;
        if(counter == 3){
            rel++;
            counter = 0;
        }
    }
    cout << rel << endl;
}