#include<bits/stdc++.h>
using namespace std;

double f(double x)
{
    return tan(x) - 1;
    }

double solve_bis(double a, double b, double eps, double c)
{
    double q;
    while (abs(a - b) > eps)
    {
        q =(a + b) / 2;
        if ((f(a) - c) * (f(q) - c) < 0)
            b = q;
        else
            a = q;
    }
    return q;
}
double solve_chord(double a, double b, double eps, double c)
{
    double fa, fb, fc, k, l, c1, c2;
    c1 = f(a);
    c2 = f(b);
    while (abs(c2 - c1) > eps) {
        c2 = c1;
        fa = f(a) - c;
        fb = f(b) - c;
        k = (fa - fb) / (a - b);
        l = fa - k * a; // b
        c1 = -l/k;
        fc = f(c1) - c;
        if ((fa * fc) <= 0)
            b = c1;
        if ((fb * fc) <= 0)
            a = c1;
    }
    return c1;
}


int solve(int method, double a, double b, double eps, double c)
{
    if ((f(a) - c)*(f(b) - c) < 0)
    {
        if (method == 1)
             {
                printf("%.6f\n", solve_bis( a, b, eps, c));
                return 0;
             }
        else if (method == 2)
             {
                printf("%.6f\n", solve_chord(a, b,  eps, c));
                return 0;
             }
        else if (method == 3)
        {
                printf("%.6f\n", solve_bis( a, b, eps, c));
                printf("%.6f\n",solve_chord(a, b, eps, c));
                return 0;
        }
    }
 return 1;

}

int main()
{
 double c;
 double a, b;
 double eps;
 int method;

 scanf ("%d%lf%lf%lf%lf", &method, &a, &b, &eps, &c);
 solve(method, a, b, eps, c);



}