题目

What is a hero? We may think of the fictional characters with supernatural powers or great people who can influence world events. Now, as the nation continues its all-out efforts to fight against the novel coronavirus pneumonia(新冠肺炎), medical staff have become heroes in the eyes of the public. As of Feb 19, a total of 32, 000 medical staff outside Hubei province have been working to treat patients around the center of the outbreak. Zhang Dingyu, the president of Wuhan Jinyintan Hospital, is one of these heroes, since the hospital received the first seven patients in December, Zhang has(1+13+14)×(13+14+15)-(1+13+14+15)×(13+14)= ．