import java.util.Scanner;

class Minzemi {
    public static void main(String args[]) {
        Scanner stdIn = new Scanner(System.in);

        String min = stdIn.next(); //文字列
        char pur = 'm';
        int count = 0; //カウント

        for(char x: min.toCharArray()){
            if(x == pur){
                count++;
            }
        }
        System.out.println(count);
    }
}