Competitions

# PP1 Week 1 Contest 2

# Find the number

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`

by absolute value.^{9}

#### Output

Print the value of **n**.

Input example #1

6 8

Output example #1

7

Input example #2

-16 -18

Output example #2

-17