package main

import (
	"fmt"
	"strings"
)

func main() {
	var s, t string
	fmt.Scan(&s)
	for i := 0; i < len(s); i++ {
		if s[i] != '-' {
			t += string(s[i])
		}
	}
	fmt.Println(strings.Count(t, "min"))
}