using System;
using System.Linq;

public class P0418 {
    public static void Main() {
        var s = Console.ReadLine().Trim();
        var mflg = false;
        var iflg = false;
        var count = 0;
        foreach(char c in s.ToCharArray()) {
            if(c == 'm') {
                mflg = true;
                iflg = false;
            } else if(c == 'i' && mflg) {
                mflg = false;
                iflg = true;
            } else if(c == 'n' && iflg) {
                mflg = false;
                iflg = false;
                count += 1;
            } else if(c == '-' && iflg) {
                //nothing to do
            } else {
                mflg = false;
                iflg = false;
            }
        }
        Console.WriteLine(count);
    }
}