#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <math.h>
#include <utility>
#include <vector>
using namespace std;


int main(void)
{
    string str;
    cin >> str;

    int a = 0;
    int c = 0;
    while((a=str.find("mi",a))!=-1)
    {
        c++;
        a+=2;
    }
    cout << c << endl;
    return 0;
}