#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    double a;
    double b;
    double c;
    cin >> a >> b >> c;
    double delta = (b * b) - 4 * a * c;
    if (delta > 0) {
        cout << "x1 =" << (-b + sqrt(delta) )/(2*a) ;
        cout << "\nx2 =" << (-b - sqrt(delta) )/(2*a);
    }
    else if ( delta = 0 ) {
        cout << -b / ( 2 * a );
    }    
    else {
        cout << "vo nghiem";
    }
    return 0;
}