import java.util.*

fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)
    var s = sc.next()
    var ans = 0
    while (true) {
        var preLen = s.length
        s = s.replace("phnom", "penh")
        val replaceCount = preLen - s.length
        ans += replaceCount

        preLen = s.length
        s = s.replace("h", "").replace("e", "h")
        if (s.length == preLen) {
            break
        }
        ans++
    }
    println(ans)
}