### COCI 2006/2007, Contest #2

## Task R2

The number S is called the **mean** of two numbers R1 and R2 if S is equal to (R1+R2)/2. Mirko's
birthday present for Slavko was two integers R1 and R2. Slavko promptly calculated their mean which
also happened to be an integer but then lost R2! Help Slavko restore R2.

### Input

The first and only line of input contains two integers R1 and S, both between -1000 and 1000.

### Output

Output R2 on a single line.

### Sample Tests

## Input11 15 ## Output19 |
## Input4 3 ## Output2 |

All Submissions

Best Solutions

**Point Value:** 3

**Time Limit:** 1.00s

**Memory Limit:** 32M

**Added:** Jul 10, 2013

**Languages Allowed:**

C++03, PAS, C, HASK, ASM, RUBY, PYTH2, JAVA, PHP, SCM, CAML, PERL, C#, C++11, PYTH3

## Comments (Search)

PEGPro2016on Nov 29, 2016 - 1:23:31 am UTC WTF???What does that mean? It sad that when submitted.

Can somebody help?

Thanks!

bbi5291on Nov 29, 2016 - 2:31:13 am UTC Re: WTF???PEGPro2016on Dec 01, 2016 - 1:49:03 am UTC Re: WTF???