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

class main{
    public static void main(String args[]){
	Scanner scan = new Scanner(System.in);

	double v = scan.nextDouble();
	int t = scan.nextInt();

	BigDecimal bigv = BigDecimal.valueOf(v);
	BigDecimal bigt = BigDecimal.valueOf(t);

	System.out.println(bigv.multiply(bigt).intValue());
    }
}