import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		s = s.replaceAll("-", "");
		int ans = 0;
		for(int i = 0 ; i < s.length() - 2 ; i += 3) {
			if(s.substring(i, i + 3).equals("min")) {
				ans++;
			}
		}
		System.out.println(ans);
	}
}