# 1981. Sticks

George took sticks of the same length and cut them randomly until all parts became at most 50 units long. Now he wants to return sticks to the original state, but he forgot how many sticks he had originally

### 输入格式

The input contains blocks of 2 lines. The first line contains the number of sticks parts after cutting, there are at most 64 sticks. The second line contains the lengths of those parts separated by the space. The last line of the file contains zero.

### 输出格式

The output should contains the smallest possible length of original sticks, one per line.

### 样例

Input
9
5 2 1 5 2 1 5 2 1
4
1 2 3 4
0

Output
6
5


60 人解决，124 人已尝试。

149 份提交通过，共有 861 份提交。

5.3 EMB 奖励。