#include "stdio.h"
#include <iostream>

using namespace std;

int main()
{
    int x, y;
    cin >> x;
    cin >> y;

    int a, b, c;

    bool bError = false;

    // - a
    if(x != 0)
    {
        a = tan((y-x)/x);
        if(a > 0)
        {
            a = sqrt(a);
        }
        else
        {
            bError = true;
        }
    }
    else
    {
        bError = true;
    }

    // - b
    if(x != 0)
    {
        b = y*y/x;
        if(b > 0)
        {
            b = ln(b);
        }
        else
        {
            bError = true;
        }
    }
    else
    {
        bError = true;
    }

    // - c
    c = y + 2.5f;
    if(c != 0)
    {
        c = arctan(c);
    }
    else
    {
        bError = true;
    }

    if(!bError)
    {
        int min = a;
        if(b < min)
            min = b;

        if(c < min)
            min = c;

        cout << min;
    }
    else
    {
    cout << "Ошибка ввода!\n";
    }

    return 0;
}