d489. 伏林的三角地 -- 板橋高中教學題 | From: [27.109.151.69] | 發表日期 : 2023-05-01 12:50

a=input()
b=a.split()
d=int(0.5*(int(b[0])+int(b[1])+int(b[2])))
e=(d*(d-int(b[0]))*(d-int(b[1]))*(d-int(b[2])))
print(e)