print reduce(lambda s,s2: s+s2**.5, reduce(lambda r,x: [r[0]+x,r[1]+x*x], [int(raw_input()) for x in range(3)], [0,0]))
cHJpbnQgcmVkdWNlKGxhbWJkYSBzLHMyOiBzK3MyKiouNSwgcmVkdWNlKGxhbWJkYSByLHg6IFtyWzBdK3gsclsxXSt4KnhdLCBbaW50KHJhd19pbnB1dCgpKSBmb3IgeCBpbiByYW5nZSgzKV0sIFswLDBdKSk=