We will buy a product for N yen (the currency of Japan) at a shop.  If we use only 1000-yen bills to pay the price, how much change will we receive?  Assume we use the minimum number of bills required.
N = int(input())
print(N-1000)
N = int(input())
if N%1000 == 0:
	print(0)
else:
	print((N//1000 + 1)*1000-N)