fix issue 17 Entering total budget

step1:

![s1](https://cloud.githubusercontent.com/assets/346723/4932836/aecb2f68-658e-11e4-942d-1c0c2df4787c.png)

step2:

![s2](https://cloud.githubusercontent.com/assets/346723/4932840/bc48edf6-658e-11e4-87fb-063767e2396c.png)