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(1000-n if n<1000 else 0)
n=int(input())
print(0 if n%1000==0 else 1000 - n%1000)