import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.next();
		scan.close();
		int cnt = 0;
		int ans = 0;
		for(int i = 0; i < S.length(); i++) {
			char c = S.charAt(i);
			if(cnt == 0 && c == 'm') {
				cnt ++;
			}else if(cnt == 1 && c == 'i') {
				cnt ++;
			}else if(cnt == 2 && c == 'n') {
				cnt ++;
				ans ++;
			}else if(cnt == 3) {
				cnt = 0;
				if(c == 'm') {
					cnt ++;
				}
			}
		}
		System.out.println(ans);
	}
}