def f(a,b,c): if a > b: max = a else: max = b if max < c: max = c return max nums = input() lst = nums.split() a = int(lst[0]) b = int(lst[1]) c = int(lst[2]) m = f(a + b, b, c) / (f(a, b + c, c) + f(a, b, b + c)) print(f'{m:.2f}')