7020: ABC173 —— A - Payment
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Description
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.
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.
Input
Input is given from Standard Input in the following format:
$N$
$N$
Output
Print the amount of change as an integer.
Constraints
$1≤N≤10000$
$N$ is an integer.
$N$ is an integer.
Sample 1 Input
1900
Sample 1 Output
100
We will use two $1000$-yen bills to pay the price and receive $100$ yen in change.
Sample 2 Input
3000
Sample 2 Output
0
We can pay the exact price.