using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;


class Program
{
    static void Main()
    {
        var S = Console.ReadLine();
        var pattern = @"mi\-*n";

        var matchs = Regex.Matches(S, pattern);
        Console.WriteLine(matchs.Count);


    }
}