> import java.io.*;
> import java.util.*;
> public class Main
> {
> 	public static void main(String [] args)throws Exception
> 	{
> 		
> 		Scanner cin=new Scanner(System.in);
> 		double D=cin.nextDouble();
> 		double H=cin.nextDouble();
> 		while(true)
> 		{
> 			double a=cin.nextDouble()/180*Math.PI;
> 			double b=cin.nextDouble()/180*Math.PI;
> 			double y=cin.nextDouble()/180*Math.PI;
> 			if(a+b+y==0)break;
> 			if(a==0||b==0||y==0)
> 			{
> 				System.out.println(0);
> 				continue;
> 			}
> 			double tanb2=Math.tan(b)*Math.tan(b);
> 			double h=Math.sqrt(2*D*D*tanb2/(1/Math.tan(y)*tanb2*1/Math.tan(y)+1/Math.tan(a)*tanb2*1/Math.tan(a)-2));
> 			System.out.println(Math.round(h+4));//这错了应该是H+h
> 		}
> 
> 	}
> }
>