Competitions
Week 1 Introduction Part 2
Find the number
Find the integer value of n, if its previous and next numbers are known.
Input data
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 data
Print the value of n.
Examples
Input example #1
6 8
Output example #1
7
Input example #2
-16 -18
Output example #2
-17