using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukikoda
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] s = Console.ReadLine().Split();
            decimal v = decimal.Parse(s[0]);
            decimal t = decimal.Parse(s[1]);

            decimal d = Math.Floor(v * t);
            Console.WriteLine(d);
        }
    }
}