I have a python DataFrame and I want to analyze it. 

```
columns=['User ID','Activity','Time Stamp','X-Axis','Y-Axis','Z-Axis']
input_data = pd.read_csv('walkingcupstairscdownstairs.txt',delimiter=',',names=columns)

```

The output is like this: 

[![enter image description here](https://i.stack.imgur.com/yEqFb.png)](https://i.stack.imgur.com/yEqFb.png)

There are several activities in `Activity` column e.g jogging, running etc. i want to know how many times jogging or walking occurs