using System;
using System.Text;
using System.Linq;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            string S = Console.ReadLine();

            int count = 0;

            string str = S.Replace("-", "");

            str.ToCharArray();

            for(int i = 0; i < str.Length - 2; i += 3)
            {
                if(S[i] == 'm' && S[i+1] == 'i' && S[i+2] == 'n')
                {
                    count++;
                }
            }
            Console.WriteLine(count);
        }        
    }
}