import java.util.Scanner;
public class Main{
	private static Scanner sc=new Scanner(System.in);
	public static void main(String args[])throws Exception{
		String s=sc.nextLine();
		int counter=0;
		while(true){
			if(s.indexOf("mi") == -1 || s.indexOf("n") == -1){
				break;
			}else{
				s=s.substring(s.indexOf("n")+1);
				counter++;
			}
		}System.out.println(counter);
	}
}