The Number of Positions Coding Question — Asked in Codeforces rated 1000.

Problem Statement :

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.

Input Format:

The only line contains three integers n, a and b (0 ≤ a, b < n ≤ 100).

Output Format:

Print the single number — the number of the sought positions.


3 1 1



Explanation of Test case:

The possible positions in the example are: 2 and 3 (if we number the positions starting with 1).


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