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

11 15

19

4 3

2

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)

Waiting for other submissions to finish... 
What does that mean? It sad that when submitted.
Can somebody help?
Thanks!

It means the Judge is busy grading other submissions. You just have to wait until it gets around to yours.

Oh. Thanks so much!