using System;
using System.Text.RegularExpressions;

class No418
{
    static void Main(string[] args) {
        string str = Console.ReadLine();
        Regex re = new Regex("mi-*n", RegexOptions.IgnoreCase | RegexOptions.Singleline);
        int count = 0;
        for (Match m = re.Match(str); m.Success; m = m.NextMatch())
        {
            count++;
        }
        Console.WriteLine(count);
    }
}