import java.util.Scanner;
import java.util.regex.Matcher;

public class Minmin {
    public static void main(String[] args) {
        Scanner stdIn = new Scanner(System.in);
        String S = stdIn.nextLine();
        int counter = 0;

        while (S.indexOf("mi") == 0) {
            S = S.substring(2);
            while (S.charAt(0) == '-') {
                S = S.substring(1);
            }
            if (S.charAt(0) == 'n') {
                counter++;
            }
        }
        
        System.out.println(counter);
    }
}