404037: GYM101401 A Smiley Faces (A)

Mr. Light got some pieces of paper, each contains one of the three symbols: '.', ':', and ')'.

He wants to use these pieces to form as many smiley faces as possible. To form one smiley face he needs one piece with a bracket ')' on it and either two pieces with dots '.', or one piece with a colon ':'.

Mr. Light has A, B, and C of each symbol of '.', ':', ad ')', respectively. What is the maximum number of smiley faces he can form?

The input contains three space-separated integers A B C (0 ≤ A, B, C ≤ 100), the number of pieces with each symbol of '.', ':', and ')', respectively.

Print the maximum number of smiley faces Mr. Light can form, on a single line.

2 2 4

3

6 4 6

6

8 1 6

5