I need to construct a majority voting (3/5) based on the (int64) elements in the various columns as new column (Voting)

```
     Column1  Column2 Column3 Column4 Column5
0   0   0   6   1   0
1   4   4   6   4   0
2   4   2   2   2   2
3   4   4   4   4   4
4   0   0   0   2   4
5   6   6   6   6   6
6   3   3   3   3   5
7   0   6   6   0   4
8   3   3   3   3   4
9   2   2   4   2   2

```

My expecting result is like:

```
     Column1  Column2 Column3 Column4 Column5 Voting
0   0   0   6   1   0       0
1   4   4   6   4   0       4      
2   4   2   2   2   2       2
3   4   4   4   4   4       4
4   0   0   0   2   4       0
5   6   6   6   6   6       6
6   3   3   3   3   5       3
7   0   6   6   0   4      -1
8   3   3   3   3   4       3
9   2   2   4   3   3      -1

```

```

where -1 is printed when we have pair number of elements.

Thanks a lot. 

```