Fruit Combinations

##### Problem statement
You are handed `a` apples and `b` oranges by Rohan. He wants to organize the fruits into baskets which he will sell later on.
However, there are some rules for these baskets,
- each basket must have **exactly** 4 fruits.
- each basket should have **at least one** apple and **at least one** orange.
Rohan wants to know how many baskets can be created from `a` apples and `b` oranges.
Help him find the maximum number of baskets that can be formed.
**Example #1**
_Input:_
```
4 4
```
_Output:_
```
2
```
_Explanation:_ ```(with 4 apples and 4 oranges, 2 teams of 'apple x2 orange x2' can be formed)```
**Example #2**
_Input:_
```
9 1
```
_Output:_
```
1
```
_Explanation:_ ```(with 9 apples and 1 orange, only 1 team of 'apple x3 orange' can be formed)```

###### Example #1

Input: 4 4 Output: 2

###### Example #2

Input: 9 1 Output: 1

##### Constraints

1 < a, b <= 10^9