#include <iostream>
using namespace std;
int main(){
    string str;
    cin >> str;
    int cnt=0;
    for(int p=0;p<str.size();p++){
        if(str[p]=='m' && str[p+1]=='i'){
            while(str[p]!='n')p++;
            cnt++;
        }
    }
    cout << cnt << endl;
    return 0;
}