package main

import (
	"bufio"
	"os"
	"strconv"
	"fmt"
)

func main() {
	N := nextInt()
	money := N * 108
	fmt.Print(money / 100)
	fmt.Print(".")
	fmt.Print(money / 10 % 10)
	fmt.Print(money % 10)

}

var s = bufio.NewScanner(os.Stdin)

func next() string {
	s.Split(bufio.ScanWords)
	s.Scan()
	return s.Text()
}
func nextLine() string {
	s.Split(bufio.ScanLines)
	s.Scan()
	return s.Text()
}

func nextInt() int {
	i, e := strconv.Atoi(next())
	if e != nil {
		panic(e)
	}
	return i
}
func nextLong() int64 {
	i, e := strconv.ParseInt(next(), 10, 64)
	if e != nil {
		panic(e)
	}
	return i
}