from math import *

def phuongtrinhbachai(list):
    if lst[0] is 0:
        if lst[1] is 0:
            if lst[2] is 0:
                print("Vo so nghiem !")
            else:
                print("Vo nghiem !")
        else:
            print("Nghiem la: ", -lst[2]/lst[1])
    else:
        delta = lst[1]**2 - 4*lst[0]*lst[2]
        if delta is 0:
            print("Phuong trinh mot nghiem: ", -lst[2]/(2*lst[0]))
        elif delta < 0:
            print("Phuong trinh vo nghiem!")
        else:
            delta = sqrt(delta);
            one = (-lst[1] + delta) / (2*lst[0]);
            two = (-lst[1] - delta) / (2*lst[0]);
            print("Hai nghiem cua phuong trinh la : ", one , " va ", two)

if __name__ == "__main__" :
  lst = []
  for i in range(3):
    lst.append(int(input("Nhap: ")))
  phuongtrinhbachai(lst)