[백준] 2909번 캔디 구매 python

c, zero = map(int, input().split())
money = int(str(1)+ "0"*zero)

m = c//money
n = c % money
if zero==0:
    print(c)
else:
    if n >= money//2:
        price = money*(m+1)
    else:
        price = money*m

    print(price)