Codeforces 124A - The number of positions

Posted 2020-10-05 午夜的行人

题目链接：http://codeforces.com/problemset/problem/124/A

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.

Examples

Input

3 1 1

Output

2

Input

5 2 3

Output

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.

题解：减去面前的与后面的再比较

 1 #include <iostream>
 2 #include <string>
 3 #include <cstring>
 4 #include <algorithm>
 5 #include <cmath>
 6 #include <map>
 7 #include <set>
 8 using namespace std;
 9 #define N 100010
10 int main()
11 {
12     int n,a,b;
13     while(cin>>n>>a>>b){
14         int s=n-a;
15         if(s>b) s=b+1;
16         cout<<s<<endl;    
17     }
18     return 0;
19 }