n, k = map(int, input().split()) a = c = 0 s = s2 = 0 for i in range(1, n+1): if i % k == 0: a += 1 s += i else: c += 1 s2 += i a1 = s / a if a > 0 else 0 a2 = s2 / c if c > 0 else 0 print("{:.1f} , {:.1f}".format(a1, a2))
太複雜了點吧