import java.util.*; import java.util.Map.Entry; import java.math.*; import java.awt.geom.*; import java.io.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); BigDecimal bd = sc.nextBigDecimal(); bd = bd.multiply(new BigDecimal("1.08")); System.out.println(bd.toString()); } }