Pfizer did a study to investigate the effect of its allergy medication. The newly developed drug was given to 250 patients having symptoms such as runny nose and dry cough. The following results were obtained from the study: 110 of the patients experienced relief from runny nose, 125 were relieved from dry cough, and 55 experienced relief from both runny nose and dry cough. Calculate the probability that a patient who takes the medicine will get relief from at least one symptom, either runny nose or dry cough.