#abc211a. [abc211_a]Blood Pressure
[abc211_a]Blood Pressure
Problem Statement
You are given a person's systolic blood pressure, , and diastolic blood pressure, .
Find the mean arterial pressure, , which we define as follows:
- .
Constraints
- All values in input are integers.
Input
Input is given from Standard Input in the following format:
Output
Print the value .
Your output is considered correct when its absolute or relative error from our answer is at most .
Sample Input 1
130 100
Sample Output 1
110
We have .
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