Question

Make them equal

You are given three integers X, Y and Z. You can perform any oft he operations of these integers any number of times:

Find the minimum number of operations required to make all three equal.

- Choose any two of these integers and increase them by 1
- Choose any 1 of these integers and increase it by 2

Find the minimum number of operations required to make all three equal.

Input

The first line of the input contains 3 space seperated integers, X, Y and Z.

Constraints:

1 <= X, Y, Z <= 10

Constraints:

1 <= X, Y, Z <= 10

^{9}Output

Print the minimum number of operations required to make all three integers equal.

Example

Sample Input:

4 5 3

Sample Output:

3

Explaination:

First we increase 3 and 5 by 1 - > [4, 6, 4]

Now we increase both fours by 1, twice - > [6, 6, 6].

4 5 3

Sample Output:

3

Explaination:

First we increase 3 and 5 by 1 - > [4, 6, 4]

Now we increase both fours by 1, twice - > [6, 6, 6].