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题库练习 The number of positions

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A8334 | $The number of positions$

时间限制1s

内存限制256MB

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题目描述

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.

输入格式

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

输出格式

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

输入输出样例

输入 #1

3 1 1

输出 #1

输入 #2

5 2 3

输出 #2

C++ 编辑器

输入

输出