# Home

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

110


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


### Sample Output 3

123