using System;
using System.Collections.Generic;
using System.Linq;

namespace yukicoder
{
    public class Program
    {
        public static void Main()
        {
            var a = Console.ReadLine().Split().Select(x => int.Parse(x)).ToArray();
            Console.WriteLine(a[0] * (a[1] + 100) / 100);
        }
    }
}