import java.io.*;
import java.util.*;

class MilesToKms{
	public static void main (String[] args)throws Exception{
		//1 mile = 1.609 344 kilometer;
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("Enter a number of miles: ");
		float miles = Float.parseFloat(bf.readLine());
		float km = miles * 1.609344f;
		System.out.println(miles + " miles is " + km + " kilometers.");
	}
}