a,b,c=map(float, input().split())
if a==0:
 print("Phuong_trinh_suy_bien_thanh_phuong_trinh_bac_1")
else:
 delta=b**2-4*a*c
 if delta<0:
  print("Vo_nghiem")
 elif delta==0:
  print(f"{-b/(2*a):.2f}")
 else:
  x1=(-b+delta**(1/2))/(2*a)
  x2=(-b-delta**(1/2))/(2*a)
  print(f"{x1:.2f} and {x2:.2f}")