using System;
using System.Text.RegularExpressions;

class Program
{
    const string SEMI = @"mi(-)*n";
    static void Main(string[] args)
    {
        var input = Console.ReadLine();
        var rgx = new Regex(SEMI);
        var mi_n_count = Regex.Matches(input, SEMI).Count;
        Console.WriteLine(mi_n_count);
    }
}