2859: ABC128A - Apple Pie
Memory Limit：128 MB
Time Limit：1.000 S
Judge Style：Text Compare
Creator：
Submit：10
Solved：8
Description
Problem Statement
We have A apples and P pieces of apple.We can cut an apple into three pieces of apple, and make one apple pie by simmering two pieces of apple in a pan.
Find the maximum number of apple pies we can make with what we have now.
Constraints
- All values in input are integers.
- 0≤A,P≤100
Input
Input
Input is given from Standard Input in the following format:
A P
Output
Output
Print the maximum number of apple pies we can make with what we have.
Sample Input Copy
1 3Sample Output Copy
3