题解 | #牛牛的水杯#

using System;
public class Program {
    public static void Main() {
        string[] s = Console.ReadLine().Split(" ");
        double[] d = 字符串数组转浮点数数组(s);
        double d1 = 3.14*d[0]*Math.Pow(d[1], 2);
        if((10000%d1) != 0)
        {
            Console.WriteLine("{0:F0}", Math.Truncate(10000 / d1)+1);
        }
        else
        {
            Console.WriteLine("{0:F0}",10000/d1);
        }
        //Console.WriteLine("{0:F0}",3.14*d[0]*Math.Pow(d[1], 2));
    }
    public static double[] 字符串数组转浮点数数组(string[] arr) {
        double[] d = new double[arr.Length];
        for (int i = 0; i < arr.Length; i++) {
            d[i] = double.Parse(arr[i]);
        }
        return d;
    }
}