A. The number of positions | Codeforces Solution | Codeforces Beta Round #92 (Div. 2 Only)

 A. 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.

Examples

input

Copy

3 1 1

output

Copy

2

input

Copy

5 2 3

output

Copy

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.