import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
public class Main {

	 public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	  BigDecimal num = BigDecimal.valueOf(Long.parseLong(stdReader.readLine()));
	    	  BigDecimal ans = num.multiply(BigDecimal.valueOf(108)).divide(BigDecimal.valueOf(100));
	    	  System.out.println(ans);
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}
}