import java.util.*;

public class Solution {
    public static void main(String args[] ) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT */
        Scanner sc = new Scanner(System.in);
        int tosses = sc.nextInt();
        int heads = sc.nextInt();
        double simulations =100000;
        double counter = 0;
        for(int i = 0; i < simulations; i++)
            {
            int total = 0;
            for(int j = 0; j < tosses;j++)
                {
                if(Math.random()>.5)
                    {
                    total++;

                }
            }
            if(total>= heads)
                {
                counter++;
            }
        }
        System.out.println(Math.round ((counter*100)/simulations));
    }
}