http://codeforces.com/problemset/problem/322/B
Ciel and Flowers
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

Fox Ciel has some flowers: r red flowers, g green flowers and b blue flowers. She wants to use these flowers to make several bouquets. There are 4 types of bouquets:

    To make a "red bouquet", it needs 3 red flowers.
    To make a "green bouquet", it needs 3 green flowers.
    To make a "blue bouquet", it needs 3 blue flowers.
    To make a "mixing bouquet", it needs 1 red, 1 green and 1 blue flower.

Help Fox Ciel to find the maximal number of bouquets she can make.
Input

The first line contains three integers r, g and b (0 ≤ r, g, b ≤ 109) — the number of red, green and blue flowers.
Output

Print the maximal number of bouquets Fox Ciel can make.
Sample test(s)
Input

3 6 9

Output

6

Input

4 4 4

Output

4

Input

0 0 0

Output

0

Note

In test case 1, we can make 1 red bouquet, 2 green bouquets and 3 blue bouquets.

In test case 2, we can make 1 red, 1 green, 1 blue and 1 mixing bouquet.