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

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double v = scan.nextDouble();
		int t = scan.nextInt();
		BigDecimal v1 = BigDecimal.valueOf(v);
		BigDecimal t1 = BigDecimal.valueOf(t);
		scan.close();

		BigDecimal ans = v1.multiply(t1);
		 BigDecimal ans1 = ans.setScale(0, BigDecimal.ROUND_DOWN);
		System.out.println(ans1);
	}
}