How would i write this in pic basic pro (Servo controller)

[Jhdgkss]

Hi there i am trying to create a program to control two servo inputs to control one servo.

The jist of it is. There are two servo inputs

Servo input 1
Servo input 2

And one output

Servo output 1

when input 1 is centerd the output 1 = Input 2
and when input one is not centered i.e its more or less then 1.5ms pulse then Output 1 = Input 2


I have enclosed a flow diagram which i think will help.

Please i need some help as it is kritical in my r/C project