#P124A. The number of positions
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ID: 2221
Type: RemoteJudge
1000ms
256MiB
Tried: 0
Accepted: 0
Difficulty: (None)
Uploaded By:
Hydro
Tags> The number of positions
No submission language available for this problem.
Description
Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can say that there are no less than a people standing in front of him and no more than b people standing behind him. Find the number of different positions Petr can occupy.
The only line contains three integers n, a and b (0 ≤ a, b < n ≤ 100).
Print the single number — the number of the sought positions.
Input
The only line contains three integers n, a and b (0 ≤ a, b < n ≤ 100).
Output
Print the single number — the number of the sought positions.
Samples
3 1 1
2
5 2 3
3
Note
The possible positions in the first sample are: 2 and 3 (if we number the positions starting with 1).
In the second sample they are 3, 4 and 5.