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



class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string inpt = Reader.ReadLine();
        int idx = 0;
        int ans = 0;
        int pos = inpt.IndexOf("mi");
        while(pos >= 0) {
            idx = pos + 2;
            pos = -1;
            for(int i=idx; i<inpt.Length; i++) {
                if(inpt[i] == '-') {
                    continue;
                } else if(inpt[i] == 'n') {
                    pos = inpt.IndexOf("mi", i);                    
                    ans++;
                    break;
                } else {
                    break;
                }
            }
        } 
        Console.WriteLine(ans);

    }

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"

mi--nminminminmi-------n



";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}