import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

    public static double f(double x1, double x2) {
        return x1+(2*x2) + (Math.pow(x1, 2)) + (3*Math.pow(x2, 2));
    }

    public static double[] fGrad(double x1, double x2) {
        double grad[] = {1+2*x1, 2+6*x2};
        return grad;
    }

    public static double[] fGrad(double[] grad, double[] gradNew) {
        double gr[] = {gradNew[0] + modulGrad(gradNew) / modulGrad(grad) * grad[0],
                gradNew[1] + modulGrad(gradNew) / modulGrad(grad) * grad[1]};
        return gr;
    }

    public static double[][] fGessian(double x1, double x2) {
        double ges[][] = {{2, 0},
                          {0, 6}};
        return ges;
    }


    public static double dGessian(double[][] gessian) {
        return gessian[0][0] * gessian[1][1] - (-gessian[0][1]) * (-gessian[1][0]);
    }

    public static double[] mul(double[][] G, double[] grad) {
        double[] direct = {G[0][0] * grad[0] + G[1][0] * grad[1], G[0][1] * grad[0] + G[1][1] * grad[1]};
        return direct;
    }

    public static double modulGrad(double[] grad) {
        return Math.sqrt(Math.pow(grad[0], 2) + Math.pow(grad[1], 2));
    }

    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        System.out.print("Enter x1:");
        double x1 = Double.parseDouble(reader.readLine());

        System.out.println("Enter x2:");
        double x2 = Double.parseDouble(reader.readLine());

        double h = 0;

        System.out.println("Enter ε:");
        double ebc = Double.parseDouble(reader.readLine());
        double[][] gessian = fGessian(x1, x2);
        double[] grad = fGrad(x1, x2);
        while (modulGrad(grad) > ebc) {
            x1 = x1 - mul(gessian, grad)[0] / dGessian(gessian);
            x2 = x2 - mul(gessian, grad)[1] / dGessian(gessian);
            grad = fGrad(x1, x2);
            gessian = fGessian(x1, x2);
        }
        System.out.println("x1= " + x1 + " x2= " + x2);
    }
}