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Contest: Task: Related: TaskB

Score : $100$ points

Problem Statement

You are given a person's systolic blood pressure, $A$, and diastolic blood pressure, $B$.
Find the mean arterial pressure, $C$, which we define as follows:

$C = \frac{A-B}{3} +B$.

Constraints

$50 \leq B \leq A \leq 300$
All values in input are integers.

Input

Input is given from Standard Input in the following format:

$A$ $B$

Output

Print the value $C$.
Your output is considered correct when its absolute or relative error from our answer is at most $10^{-5}$.

Sample Input 1

130 100

Sample Output 1

We have $C = \frac{130-100}{3} +100 = 10 + 100 = 110$.

Sample Input 2

300 50

Sample Output 2

133.3333333

Note that although all the values in input are integers, the value to output may not be an integer.

Sample Input 3

123 123