package main

import (
	"fmt"
	"log"
	"strings"
)

func main() {
	var n int
	var s string
	fmt.Scan(&n, &s)
	var HAPPY string = "HAPPY"
	cnt := 0
	for i := 0; i < 5; i++ {
		if s[len(s)-5+i] != HAPPY[i] {
			cnt++
		}
	}
	log.Println(cnt)
	cnt += strings.Count(s[:len(s)-5], "HAPPY")
	fmt.Println(cnt)
}