Submit solution

Points:
3

Time limit:
1.0s

Memory limit:
32M

Problem type

Allowed languages

Ada, Assembly, Awk, Brain****, C, C#, C++, COBOL, ~~CommonLisp~~, D, Dart, F#, Forth, Fortran, Go, ~~Groovy~~, Haskell, Intercal, Java, JS, Kotlin, Lisp, Lua, ~~Nim~~, ~~ObjC~~, OCaml, ~~Octave~~, Pascal, Perl, PHP, Pike, Prolog, Python, Racket, Ruby, Rust, Scala, Scheme, Sed, Swift, TCL, Text, Turing, VB, Zig

The number is called the **mean** of two numbers and if is equal to . Mirko's birthday present for Slavko was two integers and . Slavko promptly calculated their mean which also happened to be an integer but then lost ! Help Slavko restore .

#### Input Specification

The first and only line of input contains two integers and , both between and .

#### Output Specification

Output on a single line.

#### Sample Input 1

`11 15`

#### Sample Output 1

`19`

#### Sample Input 2

`4 3`

#### Sample Output 2

`2`

## Comments