import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.Stream;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		// D P
		int[] input = Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();

		System.out.println(input[0] * (input[1] + 100) / 100);
	}

}