// Independent offline LGPL-library caller; never part of a web Engine.
#include <iomanip>
#include <cstdlib>
#include <iostream>
#include "VBBinaryLensingLibrary.h"

int main(int argc, char** argv) {
    const double tolerance = argc > 1 ? std::atof(argv[1]) : 1e-7;
    VBBinaryLensing calculator;
    calculator.Tol = tolerance;
    calculator.RelTol = 1e-8;
    double separation, massRatio, sourceX, sourceY, sourceRadius, limbGamma;
    std::cout << std::setprecision(17);
    while (std::cin >> separation >> massRatio >> sourceX >> sourceY >> sourceRadius >> limbGamma) {
        calculator.a1 = 3 * limbGamma / (2 + limbGamma);
        const double magnification = sourceRadius == 0
            ? calculator.BinaryMag0(separation, massRatio, sourceX, sourceY)
            : limbGamma > 0
                ? calculator.BinaryMagDark(separation, massRatio, sourceX, sourceY, sourceRadius, tolerance)
                : calculator.BinaryMag(separation, massRatio, sourceX, sourceY, sourceRadius, tolerance);
        std::cout << magnification << '\n';
    }
}