#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    float a, b, c;
    float D;
    cin >> a >> b >> c;
    D = b *b - 4 * a * c;
    if (D < 0)
    {
         cout << "No real roots." << endl;
    }
    else
    {
        if (D == 0)
        {
            cout << -b / (2 * a) << endl;
        }
        else
        {
            cout << "X1 = " << (-b - sqrt (D)) / (2 * a) << ";\nX2 = " << (-b + sqrt (D)) / (2 * a) << endl;
        }
    }
    return 0;
}