A11073. Arpa and a research in Mexican wave

Arpa is researching the Mexican wave.

There are $n$ spectators in the stadium, labeled from $1$ to $n$ . They start the Mexican wave at time $0$ .

- At time $1$ , the first spectator stands.
- At time $2$ , the second spectator stands.
- $...$
- At time $k$ , the $k$ -th spectator stands.
- At time $k+1$ , the $(k+1)$ -th spectator stands and the first spectator sits.
- At time $k+2$ , the $(k+2)$ -th spectator stands and the second spectator sits.
- $...$
- At time $n$ , the $n$ -th spectator stands and the $(n-k)$ -th spectator sits.
- At time $n+1$ , the $(n+1-k)$ -th spectator sits.
- $...$
- At time $n+k$ , the $n$ -th spectator sits.

Arpa wants to know how many spectators are standing at time $t$ .

The first line contains three integers $n$ , $k$ , $t$ ( $1<=n<=10^{9}$ , $1<=k<=n$ , $1<=t<n+k$ ).

Print single integer: how many spectators are standing at time $t$ .

In the following a sitting spectator is represented as -, a standing spectator is represented as ^.

- At $t=0 $ ----------  number of standing spectators = 0.
- At $t=1 $ ^---------  number of standing spectators = 1.
- At $t=2 $ ^^--------  number of standing spectators = 2.
- At $t=3 $ ^^^-------  number of standing spectators = 3.
- At $t=4 $ ^^^^------  number of standing spectators = 4.
- At $t=5 $ ^^^^^-----  number of standing spectators = 5.
- At $t=6 $ -^^^^^----  number of standing spectators = 5.
- At $t=7 $ --^^^^^---  number of standing spectators = 5.
- At $t=8 $ ---^^^^^--  number of standing spectators = 5.
- At $t=9 $ ----^^^^^-  number of standing spectators = 5.
- At $t=10$ -----^^^^^  number of standing spectators = 5.
- At $t=11$ ------^^^^  number of standing spectators = 4.
- At $t=12$ -------^^^  number of standing spectators = 3.
- At $t=13$ --------^^  number of standing spectators = 2.
- At $t=14$ ---------^  number of standing spectators = 1.
- At $t=15$ ----------  number of standing spectators = 0.