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

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            int mcnt = 0;
            int icnt = 0;
            int ncnt = 0;
            int min = 0;
            for (int i = 0; i < input.Length; i++)
            {
                string temp = input.Substring(i, 1);
                if(temp=="m")
                {
                    mcnt++;
                }
                else if(temp=="i")
                {
                    icnt++;
                }
                else if(temp=="n")
                {
                    ncnt++;
                }
                if(mcnt==1&&icnt==1&&ncnt==1)
                {
                    min++;
                    mcnt--;
                    icnt--;
                    ncnt--;
                }
            }
            Console.WriteLine(min);
        }

    }
}