import java.util.*;
import java.text.*;

public class Exercise49{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    double v = sc.nextDouble() + 0.00001;
    int t = sc.nextInt();

    DecimalFormat df = new DecimalFormat("#.#####");

    String numStr = df.format(v);
    String x = numStr.substring(2, 6);
    String trimedStr = x.replaceFirst("^0+", "");
    int vd = Integer.parseInt(trimedStr);

    System.out.println(vd * t / 10000);
  }
}