using System;
using System.Collections.Generic;

class Program
{
    /// <summary>
    /// プログラムのエントリポイント
    /// </summary>
    /// <param name="args"></param>
    static void Main(string[] args)
    {
        string s = Console.ReadLine().Replace("-", "");

        int mincount = 0;
        int searchIndex = 0;
        while(true)
        {
            if(s.IndexOf("min", searchIndex) >= 0)
            {
                if (searchIndex + 3 >= s.Length)
                    mincount++;
                else if (s[searchIndex + 3] == 'm')
                    mincount++;

                searchIndex += 3;
                continue;
            }

            break;
        }

        Console.WriteLine(mincount);
    }
}