import java.math.BigDecimal;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    }
} import java.math.BigDecimal; BigDecimal java.math import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    }
} Main public static void main(String[] args) {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    } main {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) BigDecimal N= scan.nextBigDecimal(); N scan.nextBigDecimal() scan.nextBigDecimal scan BigDecimal M= scan.nextBigDecimal(); M scan.nextBigDecimal() scan.nextBigDecimal scan BigDecimal b3 = N.multiply(M); b3 N.multiply(M) N.multiply N M BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN); p b3.setScale(0, BigDecimal.ROUND_DOWN) b3.setScale b3 0 BigDecimal.ROUND_DOWN BigDecimal BigDecimal.ROUND_DOWN System.out.println(p) System.out.println System.out System System.out p String[] args args public class Main {

    public static void main(String[] args) {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    }
} public class Main {

    public static void main(String[] args) {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    }
} Main
import java.math.BigDecimal;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
	// write your code here


        Scanner scan = new Scanner(System.in);
        BigDecimal N= scan.nextBigDecimal();
        BigDecimal M= scan.nextBigDecimal();
        BigDecimal b3 = N.multiply(M);
BigDecimal p = b3.setScale(0, BigDecimal.ROUND_DOWN);;
        System.out.println(p);
 


    }
}
