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

namespace CSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            double m = Convert.ToDouble(Console.ReadLine());
            int k = Convert.ToInt32(Console.ReadLine());

            if(k==0)
            {
                int temp = (int)m;
                Console.WriteLine(temp);
            }
            else//实现四舍五入的方法
            {
                double temp = ((int)((m + 0.05) * 10)) / 10.0;
                Console.WriteLine(temp);
            }
        }
    }
}