#include <iostream>
#include <cmath>
using namespace std;
int main()
{
	//freopen("1.txt", "r", stdin);
	double D,H,a,b,y;
	cin>>D>>H;
	while (cin>>a>>b>>y, a+b+y > 0)
	{
		a = a/180*3.1415926;
		b = b/180*3.1415926;
		y = y/180*3.1415926;
		double tanb2 = tan(b)*tan(b);
		double h = sqrt(2*D*D*tanb2/(1/tan(y)*tanb2*1/tan(y) + 1/tan(a)*tanb2*1/tan(a)-2));
		printf("%.0lf\n", H+h);
	}
	return 0;
}