import java.util.*;
import java.math.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		BigDecimal a = BigDecimal.valueOf(sc.nextLong());
		BigDecimal b = BigDecimal.valueOf(1.08);
		BigDecimal c = a.multiply(b);
		System.out.println(c);
	}
}