#include <iostream>
#include <cmath>

using namespace std;


double f(double x)
{
    return sin(x)-x*x;
}

int main()
{
    double eps = 0.0000001;
    double a, b, c;
    cin >> a >> b;
    if (f(a)==0)
        cout << a << endl;
    if (f(b)==0)
        cout << b << endl;
    while(fabs(a-b)>eps)
    {
        c = (a+b)/2.0;
        if (f(c)==0)
        {
            cout << c << endl;
            break;
        }
        if (f(a)*f(c)<0)
            b = c;
        else
            a = c;
    }
    cout.precision(10);
    cout << fixed << c << endl;
}