Take the number of the month, in which you are born in your mind. Starting from 1 for Jan to 12 for Dec.
Double that number.
For example 9 x 2 = 18.
Next add 5 to it.
For example 18 + 5 = 23.
Then multiply the answer you got with 5.
For example 23 * 5 = 115.
Whatever answer you got in the previous step, add zero at the end of the number.
For example I got 115 answer in previous step so now it become 1150.
To the answer you got, now add your date of birth.
For example 1150 + 27 = 1177.
Now declare the final answer in textbox below.