The number of positions

Description

The number of positions

time limit per test: 0.5 second

memory limit per test: 256 megabytes

input: standard input

output: standard output

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

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.

Sample test(s)

input

3 1 1

output

2

input

5 2 3

output

3

题解：Petr站在一个n人的队列里，已知站在他前面的人不少于a，站在他后面的人不多于b，求Petr站位的所有可能数目。

判断n-a和b的大小关系，如果前者大，考虑b，否则，考虑n-a。

代码：

 #include <stdio.h>
 #include <stdlib.h>

 int main()
 {
     int n, a, b, c, r;
     scanf("%d%d%d", &n, &a, &b);
     c = n-a-;
     if(c > b) {
         r = b+;
     }else {
         r = c+;
     }
     printf("%d", r);
     return ;
 }

Problem -124A - Codeforces

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