import java.util.Scanner;
import java.lang.String;
import java.util.regex.*;
class A{
	public static void main(String args[]){
		int count=0;
	Scanner sc = new Scanner(System.in);
	String s=sc.next();
	boolean a=true;
	while(a){
		Pattern p = Pattern.compile(s);
 		Matcher m = p.matcher("min*-n");
		a = m.matches();
		count++;
		s.replaceFirst("min", "");
	}
	System.out.print(count);
	}
}