# Find the number

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Find the integer value of n, if its previous and next numbers are known.

## Input

Two integers - the previous and the next number for n, given in any order in one line, space separated. The numbers do not exceed `10^9`

by absolute value.

## Output

Print the value of n.

## Examples

Input #1

Answer #1

Input #2

Answer #2

Submissions 25K

Acceptance rate 49%