Write a C-COde to blink the character

Step1: We have to check the condition xy==3(x+y) -> xy/3 = x+y

The above statements unveil two essential points to write efficient program

1. x and y must be int value, not a real (float) value. so the xy will be
divisible by 3.

2. Maximum value of 3(x+y) is 54 if xy equals to 99 (max value of two digit).

so the xy will be less than 54.

Conclusion: we can get the result by checking the numbers which are divisible
by 3 and less than 54 instead of checking all the numbers.

Ans: 27