import java.util.*;
import java.math.BigDecimal;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  }
} import java.util.*; util.* java import java.math.BigDecimal; BigDecimal java.math public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  } main {
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) BigDecimal A = sc.nextBigDecimal(); A sc.nextBigDecimal() sc.nextBigDecimal sc BigDecimal B = sc.nextBigDecimal(); B sc.nextBigDecimal() sc.nextBigDecimal sc BigDecimal C = A.multiply(B); C A.multiply(B) A.multiply A B BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN); D C.setScale(0, BigDecimal.ROUND_DOWN) C.setScale C 0 BigDecimal.ROUND_DOWN BigDecimal BigDecimal.ROUND_DOWN System.out.println(D) System.out.println System.out System System.out D String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  }
} Main
import java.util.*;
import java.math.BigDecimal;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
	BigDecimal A = sc.nextBigDecimal();
    BigDecimal B = sc.nextBigDecimal();
    
    BigDecimal C = A.multiply(B);
    
    BigDecimal D = C.setScale(0, BigDecimal.ROUND_DOWN);
    System.out.println(D);
  }
}