import java.util.*;
import java.math.*;
public class Main{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		BigDecimal b = new BigDecimal(n);
		BigDecimal tax = new BigDecimal("1.08");
		BigDecimal value = b.multiply(tax);
		System.out.println(value);
	}
}