object Main {
	import java.util.regex._
	
	val minPat = Pattern.compile("mi-*n")
	
	def countAllMatches (pat:Pattern) (str:String) = {
		val m = pat.matcher(str)
		
		@scala.annotation.tailrec
		def loop (idx:Int) (result:Int) :Int = {
			if (!m.find(idx)) {
				result
			}else{
				val nextIdx = m.end()
				val nextResult = result + 1
				loop (nextIdx) (nextResult)
			}
		}
		loop (0) (0)
	}
	
	def main(args: Array[String]): Unit = {
		val str = readLine()
	  	println(countAllMatches (minPat) (str))
	}
}