Little Sub loves eating apples and he has n apples initially.
In the following t days, Little Sub will eat k apples each day. If the number of apple is less than k, he will eat all apples instead.
Please calculate the number of apples after t days.
In the fisrt line, it contains three integer n, k, t(0 ≤ n, k, t ≤ 2^31 − 1).
Output the answer in one line.