10695: ABC128 —— A - Apple Pie
[Creator : ]
Description
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.
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.
Input
Input is given from Standard Input in the following format:
```
$A$ $P$
```
```
$A$ $P$
```
Output
Print the maximum number of apple pies we can make with what we have.
Constraints
- All values in input are integers.
- $0 \leq A, P \leq 100$
- $0 \leq A, P \leq 100$
Sample 1 Input
1 3
Sample 1 Output
3
We can first make one apple pie by simmering two of the three pieces of apple. Then, we can make two more by simmering the remaining piece and three more pieces obtained by cutting the whole apple.
Sample 2 Input
0 1
Sample 2 Output
0
We cannot make an apple pie in this case, unfortunately.
Sample 3 Input
32 21
Sample 3 Output
58