import math

def div_calc(n, k, time):
    res_list = []
    cur = n
    count = 0
    while count < time:
        res_list.append(cur // k)
        cur = cur % k * 10
        count += 1
    res_list.insert(1, '.')
    
    return res_list 

n, k = map(int,input().split())

before_list = div_calc(n, k + 1, 2)
res = None

if before_list[-1] == 0:
    res = int(before_list[0])
else:
    res = int(before_list[0]) + 1

print(res)