Build me an app like khatabook

Build me an app like khatabook but need some feature like firstly when the name of app is calculator and when we open it shows the interface of calculator and when i enter special keyword in this such as 4+6+ and press enter then it open the main screen and my data must be stored at google drive automatically second that app with login id can be accessed through another device also.I already have an app so you dont need to make full app just add this features which i mentioned. My Budget is 1500 Rs only and need this in 1 day. If any one interested please contact me.