import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

import static java.lang.System.in;

public class No285 {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));

        BigInteger d= new BigInteger(reader.readLine());

        String result = d.multiply(BigInteger.valueOf(108)).toString();

        System.out.println(result.substring(0,result.length()-2) + "." + result.substring(result.length()-2,result.length()));
    }
}