#include <iostream>#include <cstdio>#include <cmath>using namespace std;const double EPS = 1E-9, Pi = atan(1.0) * 4.0;struct Point{double x, y;Point(double _x = 0, double _y = 0): x(_x), y(_y) {}friend double DIS (const Point& a, const Point& b){return pow(a.x-b.x, 2.0) + pow(a.y-b.y, 2.0);}};int main(){double a, W, x, y, D, A;while (~scanf("%lf%lf%lf%lf%lf%lf", &a, &W, &x, &y, &D, &A)){A = A * Pi / 180;double aa = DIS(Point(x, y), Point(-a, 0)), bb = DIS(Point(x, y), Point(a, 0)), cc = DIS(Point(a, 0), Point(-a, 0));double cita = (aa + bb - cc) / (2 * sqrt(aa*bb));cita = (acos(cita) - A) * 0.5;if (cita < 0){puts("0");continue;}double dd = tan(cita) * D * 2.0;int n = dd / W;if (!(fabs(dd / W - n) < EPS))n++;printf("%dn", n);}return 0;}
