import java.io.PrintWriter
import java.lang.Math.abs
import java.util.*

@JvmField val INPUT = System.`in`
@JvmField val OUTPUT = System.out
@JvmField val cin = INPUT.bufferedReader()
fun readLine(): String? = cin.readLine()
fun readLn() = cin.readLine()!!
@JvmField var _tokenizer: StringTokenizer = StringTokenizer("")
fun read(): String {
    while (_tokenizer.hasMoreTokens().not()) _tokenizer = StringTokenizer(cin.readLine() ?: return "", " ")
    return _tokenizer.nextToken()
}
fun readInt() = read().toInt()
fun readDouble() = read().toDouble()
fun readLong() = read().toLong()
fun readStrings(n: Int) = List(n) { read() }
fun readLines(n: Int) = List(n) { readLn() }
fun readInts(n: Int) = List(n) { read().toInt() }
fun readIntArray(n: Int) = IntArray(n) { read().toInt() }
fun readDoubles(n: Int) = List(n) { read().toDouble() }
fun readDoubleArray(n: Int) = DoubleArray(n) { read().toDouble() }
fun readLongs(n: Int) = List(n) { read().toLong() }
fun readLongArray(n: Int) = LongArray(n) { read().toLong() }
@JvmField val cout = PrintWriter(OUTPUT, false)

fun solve(){
    var s = read()
    var ans = 0
    var v = 0
    for (i in 1..2){
        for (j in 0 until s.length-4){
            if(s.substring(j, j+5) == "phnom") ans++
        }
        s = s.replace("phnom", "penh")
        if(s.contains("[he]".toRegex())){
            ans++
            s = s.replace("h", "").replace('e', 'h')
        }
    }
    for (c in "phn(om)+".toRegex().findAll(s)) {
        ans += c.value.length - 3
    }
    if(s.contains("[he]".toRegex())) ans++
    cout.println(ans)
}

fun main(args: Array<String>) {
    solve()
    cout.flush()
}