#include <math.h>
#include <stdio.h>

int main() {
    double pi = acos(-1);
    double precision = 0.00001 * pi / 180;
    double d, h, x, n1, n2;

    while (scanf("%lf %lf %lf %lf %lf", &d, &h, &x, &n1, &n2) && d) {
        double phi_min = 0;
        double phi_max = pi / 2;

        while (phi_max - phi_min > precision) {
            double phi = (phi_min + phi_max) / 2;
            double theta1 = pi / 2 - phi;
            double theta2 = asin(n2 * sin(theta1) / n1);

            if (d * tan(theta1) + h * tan(theta2) > x) {
                phi_min = phi;
            } else {
                phi_max = phi;
            }
        }

        printf("%0.02lf\n", phi_min * 180 / pi);
    }
}